cicd: Add testing

.forgejo/workflows/testing.yml

@@ -2,7 +2,23 @@ on:
   push:
     branches:
       - testing
+      - feature/forgejo-actions
 jobs:
+  test:
+    runs-on: docker
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.13'
+          cache: 'pip'
+      - name: Install needed python modules
+        working-directory: core
+        run: cd core && pip3 install -r requirements.prod.txt
+      - name: Run django tests
+        working-directory: core
+        run: python3 -m manage.py test
+
   deploy:
     runs-on: docker
     steps: