ci(oci): push helm chart package to github container registry

[mwangggg]

fixes: #161

[mwangggg]

test run in forked repo: https://github.com/mwangggg/cryostat-helm/actions/runs/9964046130
resulting package: https://github.com/mwangggg/cryostat-helm/pkgs/container/cryostat-helm%2Fcryostat

[andrewazores]

The release got created by the workflow run with no apparent errors, but no package. Maybe it just silently failed?

[andrewazores]

$ podman pull ghcr.io/cryostatio/cryostat-helm/cryostat:2.0.0-dev
Trying to pull ghcr.io/cryostatio/cryostat-helm/cryostat:2.0.0-dev...
Error: parsing image configuration: unsupported image-specific operation on artifact with type "application/vnd.cncf.helm.config.v1+json"

[andrewazores]

Image name looks wrong... though in @mwangggg's test, it has the same format and seems to have worked.

[andrewazores]

Ah I see the problem, the package does exist but it has internal visibility. I'll figure out how to update this. I think the CI job is actually working properly.

[tthvo]

Also, I think the release should not be created? Just the container image needs pushing to ghcr.io?

https://github.com/helm/chart-releaser-action?tab=readme-ov-file#inputs

The skip_upload can be set to avoid creating releases.

[andrewazores]

Looks like a release still got created. The chart_version output is also not what I expected it to be.

[tthvo]

Hmm, seems to be the image digest. Though, according this helm docs: https://helm.sh/docs/topics/registries/#the-push-subcommand, only registry/namespace can be specified with helm push.

The registry reference basename is inferred from the chart's name, and the tag is inferred from the chart's semantic version. This is currently a strict requirement.