[Travis] try run both db

.travis.yml

+env:
+  - DB=mysql
+  - DB=sqlite
 before_install: sudo apt-get install libicu-dev -y
 branches:
   only:
@@ -5,7 +8,7 @@ branches:
 rvm:
   - 1.9.2
 before_script:
-  - "cp config/database.yml.sqlite config/database.yml"
+  - "cp config/database.yml.$DB config/database.yml"
   - "cp config/gitlab.yml.example config/gitlab.yml"
   - "bundle exec rake db:create RAILS_ENV=test"
   - "bundle exec rake db:migrate RAILS_ENV=test"

config/database.yml.mysql

+development:
+  adapter: mysql2
+  encoding: utf8
+  reconnect: false
+  database: gitlabhq_development
+  pool: 5
+  username: root
+  password: "secure password"
+  # socket: /tmp/mysql.sock
+
+# Warning: The database defined as "test" will be erased and
+# re-generated from your development database when you run "rake".
+# Do not set this db to the same as development or production.
+test:
+  adapter: mysql2
+  encoding: utf8
+  reconnect: false
+  database: gitlabhq_test
+  pool: 5
+  username: root
+  password:
+  # socket: /tmp/mysql.sock
+
+production:
+  adapter: mysql2
+  encoding: utf8
+  reconnect: false
+  database: gitlabhq_production
+  pool: 5
+  username: root
+  password: "secure password"
+  # socket: /tmp/mysql.sock