Tagged Docker images lack OCI annotations

[AlexGustafsson]

Tagged Loki images don't seem to get any OCI annotations set, while the "latest" tag does. This is an issue stopping third-party tooling to scan Loki images and correlate the data with the source repository.

Example of a Loki image that does contain the appropriate labels:

docker pull grafana/loki
docker image inspect grafana/loki

"Labels": {
  "org.opencontainers.image.created": "2024-10-18T15:52:12Z",
  "org.opencontainers.image.revision": "41a2ee77e8a48639ee0e59bd636d547ff829898b",
  "org.opencontainers.image.source": "https://github.com/grafana/loki.git",
  "org.opencontainers.image.url": "https://github.com/grafana/loki"
}

Examples of Loki images that don't contain any labels:

docker pull grafana/loki:3.3.2
# 3.2.2, 3.3.2, main-82c2c56 or pretty much any other tag
docker image inspect grafana/loki:3.3.2

// ...
"Labels": null,
// ...

Note that this is also true for Promtail. Only the "latest" tag seems to get the right labels.