init gh-actions for helm chart test and push to github oci registry

[kengou]

GitHub Action to lint chart and check if version bump needed. Upload charts to GitHub.com packages

[kengou]

cc @auhlig

[SuperSandro2000]

this failed on master with:

/home/runner/work/_temp/5a3c1f00-7a12-4e2d-bf8c-d179c5c5a297.sh: line 1: ct: command not found