Include pgpool or pgbouncer for our database
As a followup on #49 (closed) and #17
We should include some connection pooling in front of our database to avoid having to set the limit of open connections too high (3000 currently)
Possible solutions: pgbouncer / Pgpool-II.
bitnami postgresql-ha chart even contains the pgpool already included
https://artifacthub.io/packages/helm/bitnami/postgresql-ha#pgpool-parameters