Add a docker-compose file and lorri-based direnv for aiding in
running and connecting to a postgres database during development of
panettone.
Change-Id: I319eee52b52cd48e1f3d2e32c558989768dc19d8
Reviewed-on: https://cl.tvl.fyi/c/depot/+/1465
Tested-by: BuildkiteCI
Reviewed-by: tazjin <mail@tazj.in>
Reviewed-by: eta <eta@theta.eu.org>