
Use the postgresql module to provision a local db (if databaseCreateLocally is true) instead of doing this locally. Switch to using the local unix socket for db connections by default; this is needed since dbs created by the postgresql module only support peer authentication. Instead of running the rake tasks db:schema:load, db:migrate and db:seed_fu, run gitlab:db:configure, which in turn runs these tasks when needed. Solves issue #53852 for gitlab.
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