refactor: remove Postal.database_url

config/database.yml

@@ -1,8 +1,18 @@
+default: &default
+  adapter: mysql2
+  encoding: <%= Postal.config.main_db.encoding %>
+  pool: <%= Postal.config.main_db.pool_size %>
+  username: <%= Postal.config.main_db.username %>
+  password: <%= Postal.config.main_db.password %>
+  host: <%= Postal.config.main_db.host %>
+  port: <%= Postal.config.main_db.port %>
+  database: <%= Postal.config.main_db.database %>
+
 development:
-  url: <%= Postal.database_url %>
+  <<: *default
 
 production:
-  url: <%= Postal.database_url %>
+  <<: *default
 
 test:
-  url: <%= Postal.database_url %>
+  <<: *default