reusable image build workflow

.github/workflows/build_image.yaml

@@ -0,0 +1,39 @@
+on:
+  workflow_call:
+    inputs:
+      docker_build_args:
+        required: false
+        type: string
+      docker_file_path:
+        required: false
+        default: "./"
+        type: string
+      image_name:
+        required: true
+        type: string
+    secrets:
+      dockerhub_user:
+        required: true
+      dockerhub_token:
+        required: true
+
+jobs:
+  build_and_push:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout the repo
+        uses: actions/checkout@v2
+      - name: Build the image
+        run: docker build -t ${{ inputs.image_name }}:${{ github.sha }} --build-arg VERSION=${{ github.ref_name }} ${{ inputs.docker_build_args }} ${{ inputs.docker_file_path }}
+      - name: Login to Docker Hub
+        uses: docker/login-action@v1
+        with:
+          username: ${{ secrets.dockerhub_user }}
+          password: ${{ secrets.dockerhub_token }}
+      - name: Push image with commit SHA
+        run: docker push ${{ inputs.image_name }}:${{ github.sha }}
+      - name: Push image with release tag
+        if: "github.event_name == 'release' && github.event.action == 'created'"
+        run: docker tag ${{ inputs.image_name }}:${{ github.sha }} ${{ inputs.image_name }}:${{ github.event.release.tag_name }} && \
+             docker push ${{ inputs.image_name }}:${{ github.event.release.tag_name }}
+

README.md

@@ -1,2 +1,20 @@
 # Workflows
-Collection of commonly used GitHubWorkflows
+
+Collection of commonly used GitHub workflows.
+
+## Building images
+
+This workflow will build and push images to Dockerhub. For any change an image with the commit SHA as tag will be published. For releases the release tag will be used to tag the image.
+
+```yaml
+jobs:
+  build_image:
+    uses: CubicrootXYZ/Workflows/.github/workflows/[email protected]
+    with:
+      docker_build_args: "--no-cache"
+      docker_file_path: "./"
+      image_name: "example/image"
+    secrets:
+      dockerhub_user: ${{ secrets.DOCKERHUB_USERNAME }}
+      dockerhub_token: ${{ secrets.DOCKERHUB_TOKEN }}
+```