Add a workflow for publishing Helm charts

[izuku-sds]

What this PR does / why we need it:

• workflow for publishing Helm charts to GHCR
• More robust tests are needed for Helm charts
• Use gh page for hosting Helm charts

Note: Good to merge after #2435 . Till then a sample helm chart is added for testing.

Which issue(s) this PR fixes (optional, in Fixes #<issue number>, #<issue number>, ... format, will close the issue(s) when PR gets merged):
Fixes #2488

Checklist:

• Docs included if any changes are user facing

[google-oss-prow]

[APPROVALNOTIFIER] This PR is NOT APPROVED

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[izuku-sds]

Please review and suggest changes.
/cc @andreyvelich @varodrig @ChenYi015

[izuku-sds]

Package and push helm chart Error should be able to pass when github.actor = kubeflow currently it is taking my username izuku-sds

[IRONICBo]

/ok-to-test
/rerun-all

[coveralls]

Pull Request Test Coverage Report for Build 14140929950

Warning: This coverage report may be inaccurate.

This pull request's base commit is no longer the HEAD commit of its target branch. This means it includes changes from outside the original pull request, including, potentially, unrelated coverage changes.

• For more information on this, see Tracking coverage changes with pull request builds.
• To avoid this issue with future PRs, see these Recommended CI Configurations.
• For a quick fix, rebase this PR at GitHub. Your next report should be accurate.

Details

• 0 of 0 changed or added relevant lines in 0 files are covered.
• 18 unchanged lines in 1 file lost coverage.
• Overall coverage increased (+0.08%) to 66.475%

---

Files with Coverage Reduction	New Missed Lines	%
pkg/runtime/framework/plugins/mpi/mpi.go	18	88.94%

Totals
Change from base Build 14113635407:	0.08%
Covered Lines:	1735
Relevant Lines:	2610

---

💛 - Coveralls