Add `/readyz` endpoint

camdetect.py

@@ -209,6 +209,13 @@ async def stream_wrapper(request):
     )
 
 
+@app.route("/readyz")
+async def ready_check(request):
+    if len(app.ctx.frames) == 2 ** SLIDE_WINDOW:
+        return response.text("OK")
+    return response.text("Not enough frames", status=503)
+
+
 @app.route('/event')
 async def wrapper_stream_event(request):
     async def stream_event(response):