[#2589] Run CI tests in parallel

.github/workflows/ci.yml

@@ -20,6 +20,9 @@ jobs:
   tests:
     name: Run the Django test suite
     runs-on: ubuntu-latest
+    strategy:
+      matrix:
+        test-type: [main, elastic]
 
     services:
       postgres:
@@ -57,13 +60,20 @@ jobs:
           setup-node: 'yes'
           npm-ci-flags: '--legacy-peer-deps'
 
-      # We temporarily disable parallel test runs due to a Django bug:
-      # https://code.djangoproject.com/ticket/32114
-      # https://github.com/django/django/pull/17650
       - name: Run tests
         run: |
-          python src/manage.py collectstatic --noinput --link
-          coverage run src/manage.py test src --exclude-tag=e2e
+          if [ "${{ matrix.test-type }}" = "main" ]; then
+            coverage run \
+              src/manage.py test src \
+              --parallel \
+              --exclude-tag=e2e \
+              --exclude-tag=elastic
+          elif [ "${{ matrix.test-type }}" = "elastic" ]; then
+            coverage run src/manage.py test src --tag=elastic --exclude-tag=e2e
+          else
+            echo "Error: Unknown test type '${{ matrix.test-type }}'"
+            exit 1
+          fi
 
         env:
           DJANGO_SETTINGS_MODULE: open_inwoner.conf.ci