Pulp

As a user, let me use the pulp3-postgres role in a way that only configures the postgres db without installing postgres (or SCL). This is helpful when I have either (a) vetted a postgres install process (eg a standardized role), or (b) an existing postgres server (or cluster) that the pulp db should be added to.

Currently, the postgres role unconditionally installs SCL and then uses a fork of geerlingguy.postgresql to install postgres.

It looks like an older version used a different role and had a flag that disabled running the installation tasks. A flag (defaulting to on) would satisfy me.