Add GitHub actions workflows for CI

- Copied from https://github.com/XAMPPRocky/mean-bean-ci-template

.github/workflows/mean_bean_ci.yml

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+name: Mean Bean CI
+
+on: [push, pull_request]
+
+jobs:
+  lints:
+    name: Lints
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout sources
+        uses: actions/checkout@v2
+        with:
+          fetch-depth: 50
+      - name: Update apt repos
+        run: sudo apt-get -y update
+      - name: Install build dependencies
+        run: sudo apt -y install libgtk-3-dev
+      - name: Install toolchain
+        uses: actions-rs/toolchain@v1
+        with:
+          profile: minimal
+          toolchain: stable
+          components: clippy, rustfmt
+          override: true
+      - name: Cargo fmt
+        uses: actions-rs/cargo@v1
+        with:
+          command: fmt
+          args: --all -- --check
+      - name: Cargo doc
+        uses: actions-rs/cargo@v1
+        with:
+          command: doc
+          args: --workspace --no-deps
+      - name: Cargo clippy
+        uses: actions-rs/clippy-check@v1
+        with:
+          token: ${{ secrets.GITHUB_TOKEN }}
+          args: --all --tests -- -D warnings
+
+  windows:
+    name: Windows
+    runs-on: windows-latest
+    needs: lints
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 50
+      - run: ci/set_rust_version.bash ${{ matrix.channel }} ${{ matrix.target }}
+        shell: bash
+      - run: ci/build.bash cargo ${{ matrix.target }}
+        shell: bash
+      - run: ci/test.bash cargo ${{ matrix.target }}
+        shell: bash
+
+    strategy:
+      fail-fast: true
+      matrix:
+        channel: [stable]
+        target:
+          # Windows
+          - i686-pc-windows-msvc
+          - x86_64-pc-windows-msvc
+
+  macos:
+    name: macOS
+    runs-on: macos-latest
+    needs: lints
+    steps:
+      - uses: actions/checkout@v2
+        with:
+          fetch-depth: 50
+      - run: ci/set_rust_version.bash ${{ matrix.channel }} ${{ matrix.target }}
+      - run: ci/build.bash cargo ${{ matrix.target }}
+      - run: ci/test.bash cargo ${{ matrix.target }}
+
+    strategy:
+      fail-fast: true
+      matrix:
+        channel: [stable]
+        target:
+          # macOS
+          - x86_64-apple-darwin

.github/workflows/mean_bean_deploy.yml

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+name: Mean Bean Deploy
+env:
+  BIN: cartunes
+
+on:
+  push:
+    # Sequence of patterns matched against refs/tags
+    tags:
+      - "[0-9]+\\.[0-9]+\\.[0-9]+" # Push events to matching semver tags
+
+jobs:
+  windows:
+    name: Windows
+    runs-on: windows-latest
+    strategy:
+      matrix:
+        target:
+          # Windows
+          - i686-pc-windows-msvc
+          - x86_64-pc-windows-msvc
+    steps:
+      - uses: actions/checkout@v2
+      - run: bash ci/set_rust_version.bash stable ${{ matrix.target }}
+      - run: bash ci/build.bash cargo ${{ matrix.target }} RELEASE
+      # TODO: Compress with UPX
+      - run: |
+          cd ./target/${{ matrix.target }}/release/
+          7z a "${{ env.BIN }}.zip" "${{ env.BIN }}.exe"
+          mv "${{ env.BIN }}.zip" $GITHUB_WORKSPACE
+        shell: bash
+        # We're using using a fork of `actions/create-release` that detects
+        # whether a release is already available or not first.
+      - uses: XAMPPRocky/[email protected]
+        id: create_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          # Draft should **always** be false. GitHub doesn't provide a way to
+          # get draft releases from its API, so there's no point using it.
+          draft: false
+          prerelease: false
+      - uses: actions/upload-release-asset@v1
+        id: upload-release-asset
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ${{ env.BIN }}.zip
+          asset_name: ${{ env.BIN }}-${{ matrix.target }}.zip
+          asset_content_type: application/zip
+
+  macos:
+    name: macOS
+    runs-on: macos-latest
+    strategy:
+      matrix:
+        target:
+          # macOS
+          - x86_64-apple-darwin
+    steps:
+      - uses: actions/checkout@v2
+      - run: ci/set_rust_version.bash stable ${{ matrix.target }}
+      - run: ci/build.bash cargo ${{ matrix.target }} RELEASE
+      # TODO: macOS app package and disk image
+      - run: tar -czvf ${{ env.BIN }}.tar.gz --directory=target/${{ matrix.target }}/release ${{ env.BIN }}
+      - uses: XAMPPRocky/[email protected]
+        id: create_release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          tag_name: ${{ github.ref }}
+          release_name: ${{ github.ref }}
+          draft: false
+          prerelease: false
+      - uses: actions/upload-release-asset@v1
+        id: upload-release-asset
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        with:
+          upload_url: ${{ steps.create_release.outputs.upload_url }}
+          asset_path: ${{ env.BIN }}.tar.gz
+          asset_name: ${{ env.BIN }}-${{ matrix.target }}.tar.gz
+          asset_content_type: application/gzip

ci/build.bash

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+#!/usr/bin/env bash
+# Script for building your rust projects.
+set -e
+
+source ci/common.bash
+
+# $1 {path} = Path to cross/cargo executable
+CROSS=$1
+# $1 {string} = <Target Triple> e.g. x86_64-pc-windows-msvc
+TARGET_TRIPLE=$2
+# $3 {boolean} = Are we building for deployment?
+RELEASE_BUILD=$3
+
+required_arg $CROSS 'CROSS'
+required_arg $TARGET_TRIPLE '<Target Triple>'
+
+if [ -z "$RELEASE_BUILD" ]; then
+    $CROSS build --target $TARGET_TRIPLE
+    $CROSS build --target $TARGET_TRIPLE --all-features
+else
+    $CROSS build --target $TARGET_TRIPLE --all-features --release
+fi
+

ci/common.bash

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+required_arg() {
+    if [ -z "$1" ]; then
+        echo "Required argument $2 missing"
+        exit 1
+    fi
+}

ci/set_rust_version.bash

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+#!/usr/bin/env bash
+set -e
+rustup default $1
+rustup target add $2

ci/test.bash

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+#!/usr/bin/env bash
+# Script for building your rust projects.
+set -e
+
+source ci/common.bash
+
+# $1 {path} = Path to cross/cargo executable
+CROSS=$1
+# $1 {string} = <Target Triple>
+TARGET_TRIPLE=$2
+
+required_arg $CROSS 'CROSS'
+required_arg $TARGET_TRIPLE '<Target Triple>'
+
+$CROSS test --target $TARGET_TRIPLE
+$CROSS test --target $TARGET_TRIPLE --all-features