test on mysql and postgres

.github/workflows/tests.yml

@@ -42,8 +42,17 @@ jobs:
   test:
     runs-on: ubuntu-20.04
     strategy:
+      fail-fast: false
       matrix:
         python-version: [ 3.8, 3.9 ]
+        database: [ sqlite, mysql ]
+        include:
+          - database: sqlite
+            database_url: "sqlite:///data/db.sqlite3"
+            database_cmd: "echo sqlite is installed"
+          - database: mysql
+            database_url: "mysql://root:root@127.0.0.1:3306/ephios"
+            database_cmd: "sudo systemctl start mysql.service"
 
     steps:
     - uses: actions/checkout@v2
@@ -58,13 +67,17 @@ jobs:
         restore-keys: |
           ${{ runner.os }}-poetry-
     - name: Install dependencies
-      run: poetry install
+      run: poetry install -E mysql -E pgsql  # install all extras to have less caches
     - name: Prepare files for test run
       run: |
         cp .env.example .env
         poetry run python manage.py collectstatic
         poetry run python manage.py compilejsi18n
+    - name: Prepare database
+      run: ${{ matrix.database_cmd }}
     - name: Test apps
+      env:
+        DATABASE_URL: ${{ matrix.database_url }}
       run: poetry run coverage run --source=ephios -m pytest tests/
     - name: Coveralls
       env: