ci: add Gitea Actions workflow

.gitea/workflows/ci.yaml

@@ -0,0 +1,12 @@
+name: CI
+on: [pull_request]
+jobs:
+  check:
+    runs-on: ubuntu-latest
+    steps:
+      - uses: actions/checkout@v4
+      - uses: actions/setup-python@v5
+        with:
+          python-version: '3.11'
+      - run: pip install -r requirements.txt
+      - run: python -m py_compile screenshot_scout.py