Adds labels with git repository information to the built image.
Adds labels with git repository information to the built image based on the standards set out in https://github.com/opencontainers/image-spec/blob/master/annotations.md.
The labels are:
|Label key|Example value|Description|
|---|---|---|
|`com.docker.github-actions-actor`|`my-username`|The actor that kicked off the workflow. For example this could be the username of the user that did the git push.|
|`com.docker.github-actions-sha`|`676cae2f85471aeff6776463c72881ebd902dcf9`|Full git SHA of the current commit.|
|`org.opencontainers.image.created`|`2020-03-06T23:00:00Z`|Date and time on which the image was built (string, date-time as defined by RFC 3339).|
|`org.opencontainers.image.source`|`https://github.com/myorg/myrepository`|URL to the GitHub repository.|
|`org.opencontainers.image.revision`|`676cae2f85471aeff6776463c72881ebd902dcf9`|The full git SHA of this commit.|