Add values for dynamic backend plugin support

[davidfestal]

Signed-off-by: David Festal dfestal@redhat.com

Description of the change

Existing or Associated Issue(s)

Additional Information

Checklist

• Chart version bumped in Chart.yaml according to semver.
• Variables are documented in the values.yaml and added to the README.md. The pre-commit utility can be used to generate the necessary content. Use pre-commit run -a to apply changes.
• JSON Schema template updated and re-generated the raw schema via pre-commit hook.
• List tests pass for Chart using the Chart Testing tool and the ct lint command.

[tumido]

I have only minor cosmetic issues, see comments inline.

[tumido]

please default to latest

[davidfestal]

Done, but afaict that will the CI tests. Should I temporarily change the tags in [CI default values](git push origin dynamic-backend-plugins:dynamic-backend-plugins) ?

[davidfestal]

In fact I have temporarily changed the CI test initContainer image tag to next in commit c20c21b.
With that tests should succeed.

[Zaperex]

Will also need to add the integrity field into the helm chart schema after janus-idp/backstage-showcase#670 is merged

"integrity": {
  "title": "Integrity checksum of the package. Optional for local packages. Supported algorithms include: `sha512`, `sha384` and `sha256`. Refer to https://w3c.github.io/webappsec-subresource-integrity/#integrity-metadata-description for more information",
  "type": "string"
}

[davidfestal]

@tumido Is the PR OK for you now ?

I assume we'll have to wait for the new release of the showcase before merging it ?

[tumido]

One last revert required, otherwise lgtm.

[tumido]

/lgtm
/approve

[Zaperex]

@davidfestal we still need to add the integrity field into the helm chart schema since janus-idp/backstage-showcase#670 and janus-idp/backstage-showcase#704 are merged.