Allow schema-push to all env with Flyway (#309)

* Make Flyway schema task work with prod and sandbox

Also renamed the 'superuser' role to 'admin' since
we do not own super user in Cloud SQL.

* Allow pushing schema to all env with Flyway

Desktop schema push to production is needed in the short term.
Long-termly we need to decide if this should be kept for glass
breaking

Schema push to sandbox and production requires interactiveconfirmation.

Also fixed a typo in initialize_roles.sql.

db/src/main/resources/sql/user/initialize_roles.sql

@@ -16,7 +16,7 @@
 -- This script should run once under the **'postgres'** user before any other
 -- roles or users are created.
 
-# Prevent backdoor grants through the implicit 'public' role.
+-- Prevent backdoor grants through the implicit 'public' role.
 REVOKE ALL PRIVILEGES ON SCHEMA public from public;
 
 CREATE ROLE readonly;