ghcr pushes to a non-unique tag

[veprbl]

This prevents PRs from pushing independent containers - everything is pushed to https://github.com/eic/containers/pkgs/container/eic_xl/642855702?tag=unstable-mr--nightly

#58 pushing manifest for ghcr.io/eic/eic_xl:unstable-mr--nightly@sha256:fb6611de4f45f848ba66cc420a0b0065ba8e3d72e889b470c02700625b7c8e7f
#58 pushing manifest for ghcr.io/eic/eic_xl:unstable-mr--nightly@sha256:fb6611de4f45f848ba66cc420a0b0065ba8e3d72e889b470c02700625b7c8e7f 0.3s done

https://eicweb.phy.anl.gov/containers/eic_container/-/jobs/7100621#L3380

Digests seems to be pushed anyway

[wdconinc]

This is because we pass the pull request number to the trigger of eicweb pipelines, but we trigger on push events on github so pull request number is always empty. This happened since we changed from triggering on pull request to push.

[veprbl]

Now I remember, you've commented about this: 99c03af#commitcomment-171345323