feat: Add stable helm chart and gh action to release it.

[AndrienkoAleksandr]

Signed-off-by: Oleksandr Andriienko oandriie@redhat.com

What does this PR do?

Add stable helm chart folder and Github action to release it. Depends on activation gh-pages for che-operator.

Screenshot/screencast of this PR

What issues does this PR fix or reference?

eclipse-che/che#20552

How to test this PR?

N/A

PR Checklist

As the author of this Pull Request I made sure that:

• The Eclipse Contributor Agreement is valid
• Code produced is complete
• Code builds without errors
• Tests are covering the bugfix
• Custom resource definition file is up to date
• OLM bundles are up to date
• The repository devfile is up to date and works
• Sections What issues does this PR fix or reference and How to test this PR completed
• Relevant user documentation updated
• Relevant contributing documentation updated
• CI/CD changes implemented, documented and communicated

Reviewers

Reviewers, please comment how you tested the PR when approving it.

[openshift-ci]

[APPROVALNOTIFIER] This PR is NOT APPROVED

This pull-request has been approved by: AndrienkoAleksandr, tolusha

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[openshift-ci]

New changes are detected. LGTM label has been removed.

[openshift-ci]

@AndrienkoAleksandr: The following tests failed, say /retest to rerun all failed tests or /retest-required to rerun all mandatory failed tests:

Test name	Commit	Details	Required	Rerun command
ci/prow/v8-multi-host-next-deployment	05b9cfb	link	true	/test v8-multi-host-next-deployment
ci/prow/v7-devworkspace-happy-path	05b9cfb	link	true	/test v7-devworkspace-happy-path

Full PR test history. Your PR dashboard.

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