Refactor workflows and helm chart

[bonddim]

Changes

Helm chart

• Updated chart with helm best practices.
• Added more configuration options.
• Generated chart Readme with helm-doc

Note

Deployment resource should be deleted before upgrade - immutable matchLabels was changed.

Workflows

• Updated all actions to latest version and added dependabot config
• Moved image build/publish into publish.yaml workflow
• Rewrite gh-pages update job
• Publish helm chart to ghcr.io oci registry also
• Added chart-testing job to pr.yaml workflow
• publish.yaml workflow is triggered from pr.yaml also, but without publishing any artifacts to registries
• Removed unused cd.yaml and utils scripts

Note

Updated release process (to avoid released image and chart overrides):

• release artifacts are builded/published on tag push events and pre-release on push to main
• pre-release version is incremented automatically
• Image with latest tag is published on main builds as previously

PS:
code-quality_checks job was renamed into code-quality

[eedorenko]

lgtm

Thanks for the contribution!

[bonddim]

@eedorenko will you merge this?