Test upgrading to PostgreSQL 11 with the GitLab chart
Summary
PostgreSQL 11 was added to Omnibus in %12.8 and will become the minimum required Postgres version by GitLab 13.0. Although we recommend that GitLab chart installs use an external Postgres database, we do include Postgres with the chart install for testing purposes. We should ensure that chart upgrades work correctly when they involve an upgrade to PG11.
Proposal
Test upgrading GitLab with the helm chart to validate if Postgres can be successfully upgraded to PG11. If problems are identified during this test, create separate issues to address the problems.
This issue might be blocked by #1848 (closed)