adagility/postgres repository overview

Same as the official postgres image, but instead of running

exec gosu postgres "$@"

this runs gosu postgres pg_ctl -D "$PGDATA" -w start, echos 'PostgreSQL server is ready!' and executes an infinite while loop while true; do sleep 2; done

We needed an indication of when the server was up in the logs -- that is how to check the container is ready in docker-it-scala.

Running in the foreground just wasn't going to do, although the exec gosu .. was nicer, the available logs would falsely alert that the postgres container was up in our CI servers, and things would start to fail randomly (time to actually get the database up varies on a CI server).

For now this is a workable solution that produces consistent results in our CI server.