feat: add a health check workflow

.github/workflows/health_check.yml

@@ -0,0 +1,29 @@
+name: Health check
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: "15 */12 * * *"
+
+jobs:
+  health-check:
+    name: Health check
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+
+      - name: Install Poetry
+        uses: snok/install-poetry@v1
+
+      - name: Set up python
+        uses: actions/setup-python@v5
+        with:
+          python-version-file: pyproject.toml
+          cache: poetry
+
+      - name: Install dependencies
+        run: poetry install --only main
+
+      - name: Run health check
+        run: poetry run python -m x_notes.health_check

x_notes/health_check.py

@@ -0,0 +1,22 @@
+import json
+from datetime import datetime, timedelta, timezone
+from io import BytesIO
+
+import requests
+
+MAX_AGE_IN_DAYS = 3
+
+
+def health_check() -> None:
+    r = requests.get(
+        "https://github.com/andylolz/x-community-notes/raw/gh-pages/_data/meta.json"
+    )
+    meta = json.load(BytesIO(r.content))
+    delta = datetime.now(timezone.utc) - datetime.fromisoformat(meta["most_recent"])
+
+    if delta > timedelta(days=MAX_AGE_IN_DAYS):
+        raise Exception(f"Most recent tweet is more than {MAX_AGE_IN_DAYS} days old.")
+
+
+if __name__ == "__main__":
+    health_check()