add sqlite to coverage report workflow

.github/workflows/ci-code.yml

@@ -27,6 +27,7 @@ jobs:
       fail-fast: false
       matrix:
         python-version: ['3.9', '3.12']
+        database-backend: [psql, sqlite]
 
     services:
       postgres:
@@ -73,7 +74,7 @@ jobs:
         AIIDA_WARN_v3: 1
       # Python 3.12 has a performance regression when running with code coverage
       # so run code coverage only for python 3.9.
-      run: uv run pytest -n auto --db-backend psql -m 'not nightly' tests/ ${{ matrix.python-version == '3.9' && '--cov aiida' || '' }}
+      run: uv run pytest -n auto --db-backend ${{ matrix.database-backend }} -m 'not nightly' tests/ ${{ matrix.python-version == '3.9' && '--cov aiida' || '' }}
 
     - name: Upload coverage report
       if: matrix.python-version == 3.9 && github.repository == 'aiidateam/aiida-core'