Fix: add branch tag for feature branch builds

Author: kimjj93

.github/workflows/build-and-push.yml

@@ -69,6 +69,8 @@ jobs:
             type=ref,event=pr,prefix=pr-
             # For main branch: use 'test' tag (local testing only, not pushed)
             type=raw,value=test,enable=${{ github.ref == 'refs/heads/main' }}
+            # For feature branches: use branch name as tag (local testing only)
+            type=ref,event=branch
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v5