Change command to start mysql from sysVinit to systemd in examples

examples/lumen-mysql.yml

@@ -42,7 +42,7 @@ jobs:
           extensions: mbstring, dom, fileinfo, mysql
           coverage: xdebug #optional
       - name: Start mysql service
-        run: sudo /etc/init.d/mysql start
+        run: sudo systemctl start mysql
       - name: Get composer cache directory
         id: composer-cache
         run: echo "::set-output name=dir::$(composer config cache-files-dir)"