Add GitHub action

.github/workflows/checks.yml

@@ -0,0 +1,23 @@
+---
+name: CI
+
+on: [push, pull_request]
+
+jobs:
+  checks:
+    runs-on: ubuntu-latest
+    # We use a standard Debian image to mirror a typical developer environment.
+    # This should be updated whenever a new Debian stable version is available.
+    container: debian:bullseye
+    steps:
+      - uses: actions/checkout@v4
+      - name: Install dependencies
+        run: |
+          apt-get update && apt-get install --yes --no-install-recommends make python3-pip
+          pip install -r test-requirements.txt
+      - name: Run lint check
+        run: |
+          make check-lint
+      - name: Run format check
+        run: |
+          make check-format