Connect to the PostgreSQL primary server instead of localhost

Move the db and user creation to its own recipe

Refs #186

site-cookbooks/kosmos-mastodon/templates/default/env.production.erb

@@ -1,15 +1,9 @@
 # Service dependencies
 REDIS_URL=<%= @redis_url %>
-DB_HOST=localhost
+DB_HOST=<%= @db_host %>
 DB_NAME=mastodon
-# TODO: Remove the condition once we have migrated mastodon to andromeda
-<% if node[:platform_version].to_f < 18.04 -%>
-DB_USER=postgres
-DB_PASS=<%= node['postgresql']['password']['postgres'] %>
-<% else -%>
 DB_USER=mastodon
 DB_PASS=<%= @db_pass %>
-<% end -%>
 DB_PORT=5432
 
 # Federation