add image publish step to release workflow

.github/workflows/release.yml

@@ -68,3 +68,63 @@ jobs:
             field_value: Released
             issues: ${{ needs.label_released_issues.outputs.issues }}
         secrets: inherit
+
+    # TODO @tom2drum refactor to reusable workflow
+    publish_image:
+        name: Publish Docker image
+        runs-on: ubuntu-latest
+        outputs:
+            shortSha: ${{ steps.output-step.outputs.short-sha }}
+            tags: ${{ steps.meta.outputs.tags }}
+        steps:
+            -   name: Check out the repo
+                uses: actions/checkout@v3
+    
+            -   name: Inject slug/short variables
+                uses: rlespinasse/github-slug-action@v4.4.1
+    
+            -   name: Set up Docker Buildx
+                uses: docker/setup-buildx-action@v2
+    
+            # Will automatically make nice tags, see the table here https://github.com/docker/metadata-action#basic
+            -   name: Docker meta
+                id: meta
+                uses: docker/metadata-action@v4
+                with:
+                    images: ghcr.io/blockscout/frontend
+    
+            -   name: Login to GitHub Container Registry
+                uses: docker/login-action@v2
+                with:
+                    registry: ghcr.io
+                    username: ${{ github.actor }}
+                    password: ${{ secrets.GITHUB_TOKEN }}
+    
+            -   name: Add SHORT_SHA env property with commit short sha
+                run: echo "SHORT_SHA=`echo ${GITHUB_SHA} | cut -c1-8`" >> $GITHUB_ENV
+
+            -   name: Debug
+                env:
+                    REF_TYPE: ${{ github.ref_type }}
+                    REF_NAME: ${{ github.ref_name }}
+                run: |
+                    echo "ref_type: $REF_TYPE"
+                    echo "ref_name: $REF_NAME"
+    
+            -   name: Add outputs
+                run: |
+                    echo "::set-output name=short-sha::${{ env.GITHUB_EVENT_PULL_REQUEST_HEAD_SHA_SHORT }}"
+                id: output-step
+    
+            -   name: Build and push
+                uses: docker/build-push-action@v3
+                with:
+                    context: .
+                    file: ./Dockerfile
+                    push: true
+                    cache-from: type=gha
+                    tags: ${{ steps.meta.outputs.tags }}
+                    labels: ${{ steps.meta.outputs.labels }}
+                    build-args: |
+                        GIT_COMMIT_SHA=${{ env.SHORT_SHA }}
+                        GIT_TAG=${{ github.ref_type == 'tag' && github.ref_name || '' }}