Docker image label is incorrect

[mook-as]

Inspecting the image ghcr.io/cfcontainerizationbot/kubecf-apps-dns:0.1.0, I see that we have:

            "Labels": {
                " org.opencontainers.image.description": "An image containing the KubeCF Apps DNS CoreDNS plugin",
                " org.opencontainers.image.title": "KubeCF Apps DNS",
                " org.opencontainers.image.url": "https://github.com/SUSE/kubecf-apps-dns",
                " org.opencontainers.image.vendor": "SUSE Cloud Application Platform",
                "org.opencontainers.image.created": "2020-09-11T07:39:34Z",
                "org.opencontainers.image.revision": "2175967e311c3ab8b4149129443caebda160374a",
                "org.opencontainers.image.source": "https://github.com/SUSE/kubecf-apps-dns",
                "org.opencontainers.image.version": "0.1.0"
            }

Notice that the first four labels have a space prefix in the key.

[andreas-kupries]

Checking the action docs at https://github.com/docker/build-push-action#customizing I found that
labels expect a LIST style value. The action definition uses a CSV style value instead AFAICT.
Maybe that is the issue ?