Fix postgreSQL persistence chart-values

[AndreasBurger]

Why do we need this PR?

Currently some of the values intended to be used by the PostgreSQL-subchart do not have the correct structure. The subchart, as it is currently used, expects them at (.values).primary.persistence (checked both the in-use version 11.9.8 and the current version 12.1.9) but they are passed along simply at (.values).persistence. The relevant part of the PostgreSQL chart documentation can be found at https://artifacthub.io/packages/helm/bitnami/postgresql#postgresql-primary-parameters.

Changes proposed in this pull request

• Move the value postgresql.persistence to postgresql.primary.persistence

Contributor Checklist

• [x] Variables are documented in the README.md
• [x] Which branch are you merging into?
  • master is for changes related to the current release of the concourse/concourse:latest image and should be good to publish immediately
  • dev is for changes related to the next release of Concourse (aka unpublished code on master in concourse/concourse)

Reviewer Checklist

This section is intended for the core maintainers only, to track review progress. Please do not fill out this section.

• [ ] Code reviewed
• [ ] Topgun tests run
• [ ] Back-port if needed
• [ ] Is the correct branch targeted? (master or dev)

[AndreasBurger]

Also, this might hint at a simple resolution for issue #162 as the requested selector value is already part of/supported by primary.persistence.

[xtremerui]

Thank you for the PR! Could you rebase and also update this line to point to the current postgresql chart version?

[AndreasBurger]

I've updated the reference to point to the version that is currently in use (11.9.8) and also rebased the branch on the latest master.