ci: start over wirh builtin mysql]

Signed-off-by: Agnes Lin <agneslin.lin@ibm.com>

.github/workflows/continuous-integration.yaml

@@ -63,9 +63,7 @@ jobs:
         # mysql -uroot -proot -e "show databases"
       - name: npm install, build, and test
         run: |
-          sudo /etc/init.d/mysql stop
-          sudo service mysql stop
-          sudo killall -KILL mysql mysqld_safe mysqld
+          sudo /etc/init.d/mysqld stop
           sudo /etc/init.d/mysql start
           sudo service mysql start
           docker ps -a