Add 'latest' tag

.github/workflows/ci.yaml

@@ -28,7 +28,7 @@ jobs:
 
       - name: Set up QEMU
         uses: docker/setup-qemu-action@v3.2.0
-        
+
       - name: Set up Docker Buildx
         uses: docker/setup-buildx-action@v3
 
@@ -37,6 +37,9 @@ jobs:
         uses: docker/metadata-action@v5
         with:
           images: ${{ env.REGISTRY }}/${{ env.IMAGE_NAME }}
+          tags:
+            # set latest tag for default branch
+            type=raw,value=latest,enable={{is_default_branch}}
 
       - name: Build and push Docker image
         uses: docker/build-push-action@v5