foreman/start-hydra: enable query log in postgres

That way it's possible to observe which queries are fired against the DB
from DBIx. This is particularly useful to find out if DBIx correctly
prefetches everything it needs or if too much / too few things are
loaded, see e.g. NixOS#1335.

foreman/start-hydra.sh

@@ -11,6 +11,8 @@ createdb -h $(pwd)/.hydra-data/postgres -p 64444 hydra
 #     FATAL:  database "USERNAME" does not exist
 createdb -h $(pwd)/.hydra-data/postgres -p 64444 "$(whoami)" || true
 
+psql -h localhost -p 64444 <<<"alter system set log_statement='all'; select pg_reload_conf();"
+
 hydra-init
 hydra-create-user alice --password foobar --role admin