Move Docker image build & push to release.yml CI workflow

.github/workflows/release.yml

@@ -1,4 +1,4 @@
-name: PyPI
+name: Release
 
 on:
   push:
@@ -10,7 +10,7 @@ on:
       - "docsrc/**"
 
 jobs:
-  build:
+  pypi:
     runs-on: ubuntu-latest
     steps:
       - uses: actions/[email protected]
@@ -24,3 +24,56 @@ jobs:
         uses: JRubics/[email protected]
         with:
           pypi_token: ${{ secrets.PYPI_API_KEY }}
+
+  docker:
+    needs: pypi
+    runs-on: ubuntu-latest
+    permissions:
+      packages: write
+      contents: read
+      attestations: write
+      id-token: write
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+
+      - name: Set GOOSEBIT_VERSION env var
+        run: |
+          if [ $GITHUB_REF_TYPE = tag ]; then
+            tag=$GITHUB_REF_NAME
+          else
+            echo "This job is only supposed to be run for Git tags"
+            exit 1
+          fi
+          echo "GOOSEBIT_VERSION=${tag#v}" >> $GITHUB_ENV
+
+      - name: Log in to Docker Hub
+        uses: docker/[email protected]
+        with:
+          username: ${{ secrets.DOCKER_USERNAME }}
+          password: ${{ secrets.DOCKER_PASSWORD }}
+
+      - name: Extract metadata (tags, labels) for Docker
+        id: meta
+        uses: docker/[email protected]
+        with:
+          images: upstreamdata/goosebit
+
+      - name: Build and push Docker image
+        id: push
+        uses: docker/[email protected]
+        with:
+          context: docker
+          build-args: GOOSEBIT_VERSION=${{ env.GOOSEBIT_VERSION }}
+          push: true
+          tags: ${{ steps.meta.outputs.tags }}
+          labels: ${{ steps.meta.outputs.labels }}
+
+      - name: Generate artifact attestation
+        uses: actions/attest-build-provenance@v1
+        with:
+          subject-name: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME}}
+          subject-digest: ${{ steps.push.outputs.digest }}
+          push-to-registry: true