Add opencontainers source label

.github/workflows/release.yml

@@ -47,7 +47,9 @@ jobs:
           context: .
           file: ./Dockerfile
           platforms: linux/amd64
-          tags: ghcr.io/fluxcd/kustomize-controller:${{ steps.get_version.outputs.VERSION }},docker.io/fluxcd/kustomize-controller:${{ steps.get_version.outputs.VERSION }}
+          tags: |
+            ghcr.io/fluxcd/kustomize-controller:${{ steps.get_version.outputs.VERSION }}
+            docker.io/fluxcd/kustomize-controller:${{ steps.get_version.outputs.VERSION }}
       - name: Publish arm64 image
         uses: docker/build-push-action@v2-build-push
         with:

Dockerfile

@@ -32,6 +32,8 @@ RUN CGO_ENABLED=0 go build -a -o kustomize-controller main.go
 
 FROM alpine:3.12
 
+LABEL org.opencontainers.image.source="https://github.com/fluxcd/kustomize-controller"
+
 RUN apk add --no-cache ca-certificates tini git gnupg
 
 COPY --from=builder /usr/local/bin/kubectl /usr/local/bin/