wubloader/postgres
Mike Lang fa1f305fda postgres: Changes to work with version 12
In postgres 12, recovery.conf is removed in favor of normal config options
plus a signal file.

See https://www.2ndquadrant.com/en/blog/replication-configuration-changes-in-postgresql-12/
for a good rundown.
..
Dockerfile Force correct postgres version
setup.sh Add tags and video_tags database columns
standby_setup.sh postgres: Changes to work with version 12