update image builder workflow

.github/workflows/image-builder.yml

@@ -2,7 +2,8 @@ name: build docker image
 
 on:
   push:
-    branches: ["main"]
+    tags:
+      - 'v*'
 
 env:
   CARGO_TERM_COLOR: always
@@ -29,13 +30,21 @@ jobs:
           username: ${{ github.actor }}
           password: ${{ secrets.GITHUB_TOKEN }}
 
-      - name: Build and push
+      - name: Push the latest Docker image
         uses: docker/build-push-action@v4
         with:
           context: .
           file: ./api/Dockerfile
           push: true
           tags: ghcr.io/${{ github.repository_owner }}/pf-api:latest
 
+      - name: Push the Docker image with the release tag
+        uses: docker/build-push-action@v4
+        with:
+          context: .
+          file: ./api/Dockerfile
+          push: true
+          tags: ghcr.io/${{ github.repository_owner }}/pf-api:${{ github.ref_name}}
+
       - name: Image digest
         run: echo ${{ steps.docker_build.outputs.digest }}