added jupyterhub ganymede image

jupyter-ganymede/docker_healthcheck.py

@@ -0,0 +1,39 @@
+#!/usr/bin/env python3
+# Copyright (c) Jupyter Development Team.
+# Distributed under the terms of the Modified BSD License.
+import json
+import os
+import subprocess
+from pathlib import Path
+
+import requests
+
+# Several operations below deliberately don't check for possible errors
+# As this is a health check, it should succeed or raise an exception on error
+
+# Docker runs health checks using an exec
+# It uses the default user configured when running the image: root for the case of a custom NB_USER or jovyan for the case of the default image user.
+# We manually change HOME to make `jupyter --runtime-dir` report a correct path
+# More information: <https://github.com/jupyter/docker-stacks/pull/2074#issuecomment-1879778409>
+result = subprocess.run(
+    ["jupyter", "--runtime-dir"],
+    check=True,
+    capture_output=True,
+    text=True,
+    env=dict(os.environ) | {"HOME": "/home/" + os.environ["NB_USER"]},
+)
+runtime_dir = Path(result.stdout.rstrip())
+
+json_file = next(runtime_dir.glob("*server-*.json"))
+
+url = json.loads(json_file.read_bytes())["url"]
+url = url + "api"
+
+proxies = {
+    "http": "",
+    "https": "",
+}
+
+r = requests.get(url, proxies=proxies, verify=False)  # request without SSL verification
+r.raise_for_status()
+print(r.content)