👷 build & publish container image

.github/workflows/build-publish.yaml

@@ -0,0 +1,66 @@
+name: 'Publish Container Image'
+
+# Controls when the action will run. Triggers the workflow on push or pull
+# request events but only for the master branch
+on:
+  push:
+    branches:
+      - '*'
+
+permissions:
+  contents: 'read'
+
+# A workflow run is made up of one or more jobs that can run sequentially or in parallel
+jobs:
+  # This workflow contains a single job called "build"
+  build-and-publish:
+    # The type of runner that the job will run on
+    runs-on: 'ubuntu-latest'
+
+    # Steps represent a sequence of tasks that will be executed as part of the job
+    steps:
+      - name: 'Checkout Repository 🛎️'
+        uses: 'actions/checkout@v2'
+
+      - name: 'Build 🏗️'
+        id: 'build'
+        run: |
+          image="$( \
+            basename "$(echo "${{ github.repository }}")" \
+            | tr '[:upper:]' '[:lower:]' \
+            | sed 's/docker-//' \
+          )"
+          echo "image=$image" >> "$GITHUB_OUTPUT"
+
+          docker build --file "Dockerfile" --tag "$image" .
+
+      - name: 'Login to GitHub Container Registry 🔑'
+        uses: 'docker/login-action@v1'
+        if: '${{ github.ref_name }} == ${{ github.event.repository.default_branch }}'
+        with:
+          registry: 'ghcr.io'
+          username: '${{ github.repository_owner }}'
+          password: '${{ secrets.GITHUB_TOKEN }}'
+
+      - name: 'Publish to Registry 🐳'
+        if: '${{ github.ref_name }} == ${{ github.event.repository.default_branch }}'
+        run: |
+          image="${{ steps.build.outputs.image }}"
+          repo="ghcr.io/${{ github.repository_owner }}/$image"
+          branch="$(echo "${{ github.ref }}" | sed -e 's,.*/\(.*\),\1,')"
+          version="$branch"
+
+          echo "repo = $repo"
+          echo "image = $image"
+          echo "version = $version"
+
+          docker tag "$image" "$repo/$image:$version"
+          docker push "$repo/$image:$version"
+
+          # Use Docker `latest` tag convention
+          if [[ "${{ github.event.repository.default_branch }}" == "$branch" ]]; then
+            docker tag "$image" "$repo/$image:latest"
+            docker push "$repo/$image:latest"
+          fi
+
+          echo "registry_uri=$repo/$image" >> "$GITHUB_OUTPUT"