Add Docker compose support for Postgres

database/.gitignore

@@ -0,0 +1,2 @@
+docker-db-data/*
+docker-pg-db-data/*

database/docker-db-data/.gitignore

@@ -1,3 +0,0 @@
-*
-*/
-!.gitignore

database/postgres-scripts/create-db-and-admin-user.sql

@@ -1,3 +1,4 @@
+CREATE DATABASE cosmic;
 CREATE USER cosmic_admin WITH ENCRYPTED PASSWORD 'redsnailshell';
 GRANT ALL PRIVILEGES ON DATABASE cosmic TO cosmic_admin;
 ALTER ROLE cosmic_admin WITH CREATEROLE;