create workflow to publish prod image to ghcr

.github/workflows/ghcr.yml

@@ -0,0 +1,69 @@
+name: Container image
+
+on:
+  release:
+    types: [created]
+
+  # Run build for any PRs - we won't push in those however
+  pull_request:
+    branches:
+      - main
+
+  # Publish `main` as Docker `dev` image.
+  push:
+    branches:
+      - main
+
+concurrency:
+  group: build-${{ github.ref }}
+  cancel-in-progress: true
+
+env:
+  IMAGE_NAME: projectcaluma/s3-hooked
+  REGISTRY: ghcr.io
+
+jobs:
+  # Push image to GitHub Packages.
+  # See also https://docs.docker.com/build/ci/github-actions/
+  container-registry:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+
+    steps:
+      - uses: actions/checkout@v3
+
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+
+      - name: Log in to the Container registry
+        uses: docker/login-action@v2
+        if: github.event_name != 'pull_request'
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ secrets.GITHUB_TOKEN }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/metadata-action@v4
+        with:
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags: |
+            type=raw,value=dev,enable={{is_default_branch}}
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+            type=semver,pattern={{major}}
+
+      - name: Build and push
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./Dockerfile
+          target: prod
+          push: ${{ github.event_name != 'pull_request' }}
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          cache-from: type=gha
+          cache-to: type=gha,mode=max