ci: uninstall default mysql

.github/workflows/ci.yml

@@ -8,9 +8,18 @@ jobs:
     strategy:
       matrix:
         os: [ubuntu-latest, macos-latest]
-    runs-on: ubuntu-latest
+    runs-on: ${{ matrix.os }}
     steps:
       - uses: actions/checkout@v2
+      - name: Shutdown Ubuntu MySQL
+        if: matrix.os == 'ubuntu-latest'
+        run: |
+          sudo service mysql stop
+          sudo apt-get remove --purge mysql-server mysql-client mysql-common -y
+          sudo apt-get autoremove -y
+          sudo apt-get autoclean
+          sudo rm -rf /etc/mysql
+          sudo rm -rf /var/lib/mysql
       - name: Setup Fluent CI
         uses: fluentci-io/setup-fluentci@v5
         with: