fix compose

docker-compose.yml

@@ -11,7 +11,7 @@ services:
           "CMD",
           "python",
           "-c",
-          "import urllib.request; import sys; req = urllib.request.Request('http://localhost:${PORT}/health'); sys.exit(0) if urllib.request.urlopen(req).read() == b'OK' else sys.exit(1)",
+          "import json, urllib.request, sys; r = urllib.request.urlopen('http://localhost:${PORT}/health'); d = json.load(r); sys.exit(0) if r.getcode()==200 and d.get('status')=='ok' else sys.exit(1)",
         ]
       interval: 30s
       timeout: 10s