ci: add static analysis steps (format+lint+validate yaml)

.forgejo/workflows/ci.yml

@@ -0,0 +1,14 @@
+on: [push, pull_request]
+
+jobs:
+  static_analysis:
+    runs-on: runner-latest
+    steps:
+      - uses: actions/checkout@v4
+      - name: Linting
+        run: pipx run pre-commit run ruff -a
+      - name: Format
+        run: pipx run pre-commit ruff-format -a
+      - name: Validate Yaml
+        run: pipx run pre-commit check-yaml -a
+