Update python-app.yml

Add MariaDB Connector/C install

.github/workflows/python-app.yml

@@ -16,11 +16,15 @@ jobs:
 
     steps:
     - uses: actions/checkout@v2
+    - name: Install MariaDB Connector/C
+      run: |
+        sudo apt-get update
+        sudo apt-get install mariadb-server libmariadb3
     - name: Set up Python 3.10
       uses: actions/setup-python@v2
       with:
         python-version: "3.10"
-    - name: Install dependencies
+    - name: Install Python dependencies
       run: |
         python -m pip install --upgrade pip
         pip install flake8 pipenv