Use custom ports for postgres/hydra

Use custom ports so hydra and postgres can run in environments where
the default ports are in use already.

scripts/start-postgres.sh

@@ -1,4 +1,4 @@
 #!/bin/sh
 
 initdb ./.hydra-data/postgres
-exec postgres -D ./.hydra-data/postgres -k $(pwd)/.hydra-data/postgres
+exec postgres -D ./.hydra-data/postgres -k $(pwd)/.hydra-data/postgres -p 64444