Add release trigger and image tagging to CI workflow PR

.github/workflows/build.yml

@@ -6,6 +6,9 @@ on:
   push:
     branches:
       - main
+  release:
+    types: [published]
+
 
 jobs:
   build-push:
@@ -38,7 +41,7 @@ jobs:
 
       - name: Set up image metadata
         id: meta
-        uses: docker/metadata-action@v5
+        uses: docker/metadata-action@v6
         if: ${{ github.event_name != 'release' }}
         with:
           images: |
@@ -62,3 +65,30 @@ jobs:
           platforms: linux/amd64,linux/arm64
           cache-from: type=gha
           cache-to: type=gha,mode=max
+            # release metadata
+
+      - name: Set up release image metadata
+        id: meta-release
+        uses: docker/metadata-action@v6
+        if: ${{ github.event_name == 'release' }}
+        with:
+          images: |
+            ghcr.io/bento-platform/discovery_config_validator
+          flavor: |
+            latest=true
+          tags: |
+            type=semver,pattern={{version}}
+            type=semver,pattern={{major}}.{{minor}}
+
+      - name: Build and push release image
+        uses: docker/build-push-action@v6
+        if: ${{ github.event_name == 'release' }}
+        with:
+          context: .
+          file: Dockerfile
+          push: true
+          tags: ${{ steps.meta-release.outputs.tags }}
+          labels: ${{ steps.meta-release.outputs.labels }}
+          platforms: linux/amd64,linux/arm64
+          cache-from: type=gha
+          cache-to: type=gha,mode=max