Update examples to start mysql service

examples/cakephp-mysql.yml

@@ -34,6 +34,8 @@ jobs:
           # Install memcached if using ext-memcached
           extensions: mbstring, intl, redis, pdo_mysql
           coverage: pcov
+      - name: Start mysql service
+        run: sudo /etc/init.d/mysql start
       - name: Get composer cache directory
         id: composer-cache
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"