diff --git a/.github/workflows/build.yml b/.github/workflows/build.yml
deleted file mode 100644
index 2ae58a45147..00000000000
--- a/.github/workflows/build.yml
+++ /dev/null
@@ -1,205 +0,0 @@
-#
-##  Copyright (c) 2020, The OpenThread Authors.
-##  All rights reserved.
-##
-##  Redistribution and use in source and binary forms, with or without
-##  modification, are permitted provided that the following conditions are met:
-##  1. Redistributions of source code must retain the above copyright
-##     notice, this list of conditions and the following disclaimer.
-##  2. Redistributions in binary form must reproduce the above copyright
-##     notice, this list of conditions and the following disclaimer in the
-##     documentation and/or other materials provided with the distribution.
-##  3. Neither the name of the copyright holder nor the
-##     names of its contributors may be used to endorse or promote products
-##     derived from this software without specific prior written permission.
-##
-##  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-##  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-##  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-##  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-##  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-##  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-##  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-##  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-##  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-##  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-##  POSSIBILITY OF SUCH DAMAGE.
-##
-
-name: Build
-
-on: [push, pull_request]
-
-jobs:
-
-  cancel-previous-runs:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: rokroskar/workflow-run-cleanup-action@master
-      env:
-        GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
-      if: "github.ref != 'refs/heads/master'"
-
-  pretty:
-    runs-on: ubuntu-20.04
-    steps:
-    - uses: actions/checkout@v2
-    - name: Bootstrap
-      run: sudo BUILD_TARGET=pretty-check tests/scripts/bootstrap.sh
-    - name: Check
-      run: script/make-pretty check
-
-  android-check:
-    runs-on: ubuntu-18.04
-    strategy:
-      matrix:
-        mdns: ["mDNSResponder", ""]
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-    - name: Check
-      env:
-        OTBR_MDNS: ${{ matrix.mdns }}
-      run: >
-        docker run --rm -v $PWD:/build/ot-br-posix openthread/android-trusty bash -c
-        "BUILD_TARGET=android-check ot-br-posix/tests/scripts/bootstrap.sh && \
-         ot-br-posix/tests/scripts/check-android-build"
-
-  check:
-    runs-on: ubuntu-18.04
-    strategy:
-      matrix:
-        mdns: ["mDNSResponder", "avahi"]
-    env:
-      BUILD_TARGET: check
-      OTBR_MDNS: ${{ matrix.mdns }}
-      OTBR_COVERAGE: 1
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-    - name: Bootstrap
-      run: tests/scripts/bootstrap.sh
-    - name: Run
-      run: script/test build check
-    - name: Codecov
-      uses: codecov/codecov-action@v1
-
-  rest-check:
-    runs-on: ubuntu-18.04
-    strategy:
-      matrix:
-        rest: ["rest-off", ""]
-    env:
-      BUILD_TARGET: check
-      OTBR_REST: ${{ matrix.rest }}
-      OTBR_COVERAGE: 1
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-    - name: Bootstrap
-      run: tests/scripts/bootstrap.sh
-    - name: Run
-      run: script/test build check
-    - name: Codecov
-      uses: codecov/codecov-action@v1
-
-  script-check:
-    runs-on: ubuntu-18.04
-    env:
-      BUILD_TARGET: script-check
-      OTBR_COVERAGE: 1
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-    - name: Bootstrap
-      run: tests/scripts/bootstrap.sh
-    - name: Run
-      run: tests/scripts/check-scripts
-    - name: Codecov
-      uses: codecov/codecov-action@v1
-
-  scan-build:
-    runs-on: ubuntu-18.04
-    env:
-      BUILD_TARGET: scan-build
-      CC: clang
-      CXX: clang++
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-    - name: Bootstrap
-      run: tests/scripts/bootstrap.sh
-    - name: Run
-      run: tests/scripts/check-scan-build
-
-  package:
-    runs-on: ubuntu-18.04
-    env:
-      BUILD_TARGET: package
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-    - name: Bootstrap
-      run: |
-        tests/scripts/bootstrap.sh
-        sudo pip3 install --system -U cmake==3.10.3
-        cmake --version | grep 3.10.3
-    - name: Build
-      run: script/test package
-
-  thread-1-2-backbone:
-    runs-on: ubuntu-18.04
-    env:
-      PACKET_VERIFICATION: 1
-      REFERENCE_DEVICE: 1
-      THREAD_VERSION: 1.2
-      INTER_OP: 1
-      VIRTUAL_TIME: 0
-      PYTHONUNBUFFERED: 1
-      OTBR_COVERAGE: 1
-    steps:
-      - uses: actions/checkout@v2
-        with:
-          submodules: true
-      - name: Build OTBR Docker Image
-        run: |
-          otbr_options="-DOT_DUA=ON -DOT_MLR=ON -DOTBR_COVERAGE=ON"
-          otbr_image_name="otbr-ot12-backbone-ci"
-          docker build -t "${otbr_image_name}" -f etc/docker/Dockerfile . \
-            --build-arg BACKBONE_ROUTER=1 \
-            --build-arg REFERENCE_DEVICE=${REFERENCE_DEVICE} \
-            --build-arg OT_BACKBONE_CI=1 \
-            --build-arg NAT64=0 \
-            --build-arg OTBR_OPTIONS="${otbr_options}"
-      - name: Bootstrap OpenThread Test
-        run: |
-          sudo rm /etc/apt/sources.list.d/* && sudo apt-get update
-          sudo apt-get --no-install-recommends install -y python3-setuptools python3-wheel ninja-build socat
-          python3 -m pip install -r third_party/openthread/repo/tests/scripts/thread-cert/requirements.txt
-      - name: Build OpenThread
-        run: |
-          (cd third_party/openthread/repo && ./script/test build)
-      - name: Get Thread-Wireshark
-        run: |
-          (cd third_party/openthread/repo && ./script/test get_thread_wireshark)
-      - name: Run Test
-        run: |
-          export CI_ENV="$(bash <(curl -s https://codecov.io/env)) -e GITHUB_ACTIONS -e OTBR_COVERAGE"
-          echo "CI_ENV=${CI_ENV}"
-          (cd third_party/openthread/repo && sudo -E ./script/test cert_bbr ./tests/scripts/thread-cert/backbone/*.py || (sudo chmod a+r *.log *.json *.pcap && false))
-      - uses: actions/upload-artifact@v2
-        if: ${{ failure() }}
-        with:
-          name: thread-1-2-backbone-results
-          path: |
-            third_party/openthread/repo/*.pcap
-            third_party/openthread/repo/*.json
-            third_party/openthread/repo/*.log
-      - name: Codecov
-        uses: codecov/codecov-action@v1
diff --git a/.github/workflows/docker.yml b/.github/workflows/docker.yml
deleted file mode 100644
index c60a6959c8e..00000000000
--- a/.github/workflows/docker.yml
+++ /dev/null
@@ -1,105 +0,0 @@
-#
-#  Copyright (c) 2020, The OpenThread Authors.
-#  All rights reserved.
-#
-#  Redistribution and use in source and binary forms, with or without
-#  modification, are permitted provided that the following conditions are met:
-#  1. Redistributions of source code must retain the above copyright
-#     notice, this list of conditions and the following disclaimer.
-#  2. Redistributions in binary form must reproduce the above copyright
-#     notice, this list of conditions and the following disclaimer in the
-#     documentation and/or other materials provided with the distribution.
-#  3. Neither the name of the copyright holder nor the
-#     names of its contributors may be used to endorse or promote products
-#     derived from this software without specific prior written permission.
-#
-#  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
-#  AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
-#  IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
-#  ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT HOLDER OR CONTRIBUTORS BE
-#  LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
-#  CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
-#  SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
-#  INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
-#  CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
-#  ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
-#  POSSIBILITY OF SUCH DAMAGE.
-#
-
-name: Docker
-
-on: [push, pull_request]
-
-jobs:
-
-  cancel-previous-runs:
-    runs-on: ubuntu-latest
-    steps:
-    - uses: rokroskar/workflow-run-cleanup-action@master
-      env:
-        GITHUB_TOKEN: "${{ secrets.GITHUB_TOKEN }}"
-      if: "github.ref != 'refs/heads/master'"
-
-  buildx:
-    runs-on: ubuntu-latest
-    strategy:
-      matrix:
-        include:
-          - build_args: ""
-            push: yes
-          - build_args: "--build-arg OT_BACKBONE_CI=1"
-    steps:
-    - uses: actions/checkout@v2
-      with:
-        submodules: true
-    - name: Set up QEMU
-      uses: docker/setup-qemu-action@v1
-      with:
-        platforms: all
-    - name: Set up Docker Buildx
-      id: buildx
-      uses: docker/setup-buildx-action@v1
-    - name: Prepare
-      id: prepare
-      run: |
-        DOCKER_IMAGE=openthread/otbr
-        DOCKER_PLATFORMS=linux/amd64,linux/arm/v7,linux/arm64
-        VERSION=latest
-
-        TAGS="--tag ${DOCKER_IMAGE}:${VERSION}"
-
-        echo ::set-output name=docker_image::${DOCKER_IMAGE}
-        echo ::set-output name=version::${VERSION}
-        echo ::set-output name=buildx_args::--platform ${DOCKER_PLATFORMS} \
-          --build-arg VERSION=${VERSION} \
-          --build-arg BUILD_DATE=$(date -u +'%Y-%m-%dT%H:%M:%SZ') \
-          --build-arg VCS_REF=${GITHUB_SHA::8} \
-          ${{ matrix.build_args }} \
-          ${TAGS} --file etc/docker/Dockerfile .
-
-    - name: Docker Buildx (build)
-      run: |
-        docker buildx build --output "type=image,push=false" ${{ steps.prepare.outputs.buildx_args }}
-
-    - name: Docker Login
-      if: success() && github.repository == 'openthread/ot-br-posix' && github.event_name != 'pull_request' && matrix.push
-      env:
-        DOCKER_USERNAME: ${{ secrets.DOCKER_USERNAME }}
-        DOCKER_PASSWORD: ${{ secrets.DOCKER_PASSWORD }}
-      run: |
-        echo "${DOCKER_PASSWORD}" | docker login --username "${DOCKER_USERNAME}" --password-stdin
-
-    - name: Docker Buildx (push)
-      if: success() && github.repository == 'openthread/ot-br-posix' && github.event_name != 'pull_request' && matrix.push
-      run: |
-        docker buildx build --output "type=image,push=true" ${{ steps.prepare.outputs.buildx_args }}
-
-    - name: Docker Check Manifest
-      if: always() && github.repository == 'openthread/ot-br-posix' && github.event_name != 'pull_request' && matrix.push
-      run: |
-        docker run --rm mplatform/mquery ${{ steps.prepare.outputs.docker_image }}:${{ steps.prepare.outputs.version }}
-
-    - name: Clear
-      if: always() && github.repository == 'openthread/ot-br-posix' && github.event_name != 'pull_request' && matrix.push
-      run: |
-        rm -f ${HOME}/.docker/config.json
diff --git a/tests/scripts/bootstrap.sh b/tests/scripts/bootstrap.sh
index 94423419efd..dbd7b3d4008 100755
--- a/tests/scripts/bootstrap.sh
+++ b/tests/scripts/bootstrap.sh
@@ -164,7 +164,7 @@ case "$(uname)" in
             IMAGE_FILE="$IMAGE_NAME".img
             [ -f "$TOOLS_HOME"/images/"$IMAGE_FILE" ] || {
                 # unit MB
-                EXPAND_SIZE=1024
+                EXPAND_SIZE=4096
 
                 [ -d "$TOOLS_HOME"/images ] || mkdir -p "$TOOLS_HOME"/images
 
diff --git a/tests/scripts/check-raspbian b/tests/scripts/check-raspbian
index c4db478a567..e05626e0447 100755
--- a/tests/scripts/check-raspbian
+++ b/tests/scripts/check-raspbian
@@ -58,6 +58,7 @@ echo 1 | sudo tee /proc/sys/net/ipv6/conf/all/disable_ipv6
 apt-get update
 apt-get install -y --no-install-recommends git
 su -m -c 'script/bootstrap' pi
+su -m -c 'df' pi
 su -m -c 'NETWORK_MANAGER=0 script/setup' pi
 EOF