ci: add Forgejo Actions workflow for test automation

Runs ruff lint and pytest on push/PR to master.

.forgejo/workflows/ci.yml

@@ -0,0 +1,25 @@
+name: CI
+
+on:
+  push:
+    branches: [master]
+  pull_request:
+    branches: [master]
+
+jobs:
+  test:
+    runs-on: python
+    defaults:
+      run:
+        working-directory: services/api
+    steps:
+      - uses: actions/checkout@v4
+
+      - name: Install dependencies
+        run: pip install -e ".[dev]"
+
+      - name: Lint
+        run: ruff check app/ tests/
+
+      - name: Run tests
+        run: python -m pytest tests/ -v