add healthcheck

Dockers/puppeteer-api/main.py

@@ -16,6 +16,10 @@ async def wait_for_network_idle(page):
     """Wait until no network requests are in flight"""
     await page.waitForNetworkIdle(idleTime=500, timeout=30000)
 
+@app.head("/")
+async def health_check():
+    return {"status": "ok"}
+
 @app.get("/")
 async def visit_url(url: str, x_api_key: Optional[str] = Header(None)):
     # Validate API key