Set default OCI labels on Docker image

[MPV]

There are a few predefined/standardized docker image labels as part of the OCI specifications, as listed here:

• https://github.com/opencontainers/image-spec/blob/main/annotations.md

How about sbt-native-packager starts setting a few (or most) of those?

[MPV]

Here's an example of where this can come of use:

• https://docs.renovatebot.com/modules/datasource/docker/#description

[dwickern]

Here's how I set mine if you want to use it as a starting point. I use sbt-git to get the commit hash.

dockerLabels ++= {
  import com.github.sbt.git.GitPlugin.autoImport._
  val source = scmInfo.value.map(info => "org.opencontainers.image.source" -> info.browseUrl.toString)
  val revision = git.gitHeadCommit.value.map("org.opencontainers.image.revision" -> _)
  Map(
    "org.opencontainers.image.description" -> packageSummary.value,
    "org.opencontainers.image.version" -> version.value,
    "org.opencontainers.image.vendor" -> maintainer.value,
  ) ++ source ++ revision
}

There are other keys like description or packageDescription that could be used instead

[muuki88]

@MPV mind adding this to the docs? I didn't know about those until now, but they seem pretty useful!