Set a proper GitHub URL in image labels

Make sure that an image has been built #6
Set a proper GITHUB_URL #7

Build with cache

docker pull to use the cache when building #5

org.opencontainers labels added

org.opencontainers labels are added now:

{
  "org.label-schema.build-date": "2021-07-01T14:28:46Z",
  "org.label-schema.vcs-ref": "6f51d3d7bb7d46959a26594cb2b807573e34c546",
  "org.label-schema.vcs-url": "https://github.com/macbre/push-to-ghcr.git",
  "org.opencontainers.image.created": "2021-07-01T14:28:46Z",
  "org.opencontainers.image.revision": "6f51d3d7bb7d46959a26594cb2b807573e34c546",
  "org.opencontainers.image.source": "https://github.com/macbre/push-to-ghcr.git"
}

Add opencontainers labels #2
Make sure that an image has been pushed and is properly labelled #3

Production ready version

v1.0.0

Update README.md

Initial version

v0.0.1

Create action.yml