Create postgresql12 service on deploy
We want to migrate our data to a new version of postgres. It seems there's no easy way to do this with separate containers and an external data volume.
The procedure we'll follow is:
- Create a new volume and new service for postgresql12
- Log in the VM and dump the database to a backup file
- Load this backup file into the postgresql12 database
- Remove the old postgresql service from the playbook and adjust the new postgresql service (ports)
This commit is the step (1) of this procedure.
Part of #45 (closed)