feat: ED-1175 Standalone helm chart for Learner service

[beepdot]

This PR introduces a standalone helm chart for learner service and learner opa policies. There is no dependency on ansible with this chart. If an adopter wants to use only this microservice for their use case, they can take the helm/learner/learner_sample_values.yaml values file into their private repo and change as per their need. If an adopter wants to take the entire Lern BB, then their would be a separate lern_bb_values_sample.yaml file which would be a superset of all the values belonging to the Lern BB.

This PR includes the following -

• Includes learner service and learner opa policies standalone charts
• Adds the learner opa policy chart as a dependency to avoid tight coupling
• Adds the common opa policy chart as a dependency which comes from an external helm repository
• Adds the user access keys chart as a dependency (via common opa policy dependency)
• Adds the common templates chart as a dependency (via common opa policy dependency)

Templating command:

helm template helm/learner -f helm/learner/learner_sample_values.yaml

Note:

• The index.yaml is pointing to the fork url. This needs to be changed to the official helm repository url after creation of the repository and these packages (*.tgz) should be moved to the official helm repository.
• The .github/workflows/static.yml file also needs to be updated as per the helm repository location or can be removed if not required

Common charts which are a dependency are published here - https://github.com/Sunbird-Ed/sunbird-helmchart-templates
Reference PR for common charts - Sunbird-Ed/sunbird-helmchart-common#1

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