Run MySQL step on condition

Author: jj22ee

.github/workflows/UnitTesting.yaml

@@ -29,6 +29,7 @@ jobs:
         uses: actions/checkout@v3
 
       - name: Start MySQL
+        if: ${{ matrix.testenv == 'ext' }}
         run: |
           sudo /etc/init.d/mysql start
           mysql -e 'CREATE DATABASE ${{ env.DB_DATABASE }};' -u${{ env.DB_USER }} -p${{ env.DB_PASSWORD }}