Add workflow for publishing container image

Relates to Green-Software-Foundation#252 and Green-Software-Foundation#326

Signed-off-by: Yasumasa Suenaga <[email protected]>

.github/workflows/2-release.yaml

@@ -0,0 +1,47 @@
+name: Publish container image to GitHub Packages
+
+on:
+  release:
+    types: [published]
+
+env:
+  REGISTRY: ghcr.io
+  IMAGE_NAME: ${{ github.repository }}
+
+concurrency:
+  group: publish
+  cancel-in-progress: true
+
+jobs:
+  publish-container-image:
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+    steps:
+      - name: Set up QEMU
+        uses: docker/setup-qemu-action@v2
+      - name: Set up Docker Buildx
+        uses: docker/setup-buildx-action@v2
+      - name: Log in to the Container registry
+        uses: docker/[email protected]
+        with:
+          registry: ${{ env.REGISTRY }}
+          username: ${{ github.actor }}
+          password: ${{ github.token }}
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/[email protected]
+        with:
+          tags: type=raw,value=${{ github.ref_name }}
+          flavor: latest=true
+          images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+      - name: Build and push Docker image
+        uses: docker/[email protected]
+        with:
+          context: "{{defaultContext}}:src"
+          file: CarbonAware.WebApi/src/Dockerfile
+          platforms: linux/amd64,linux/arm64
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+          provenance: false