Bring back database.yml

It only contains the development database configuration by default since
we're relying on docker-compose for starting our database now.

.gitignore

@@ -19,7 +19,6 @@
 /log/*.log
 /public/assets/
 /tmp
-config/database.yml
 config/deploy.rb
 config/site.yml
 db/data.yml

config/database.yml

@@ -0,0 +1,22 @@
+development:
+  adapter: mysql2
+  database: tracks
+  # set this if you are storing utf8 in your mysql database to handle strings
+  # like "Réné". Not needed for sqlite. For PostgreSQL use encoding: unicode
+  # encoding: utf8
+  host: db
+  username: root
+  password:
+
+# Production config is disabled by default
+#
+# production:
+#  adapter: mysql2
+#  database: tracks
+#  # set this if you are storing utf8 in your mysql database to handle strings
+#  # like "Réné".Not needed for sqlite. For PostgreSQL use encoding: unicode
+#  # encoding: utf8
+#  host: localhost
+#  username: root
+#  password:
+