chore: import upstream snapshot with attribution

doc/source/cluster/doc_code/yarn/dashboard.py

@@ -0,0 +1,18 @@
+import skein
+import sys
+from urllib.parse import urlparse
+
+if __name__ == "__main__":
+    if len(sys.argv) < 2:
+        print("Usage: python dashboard.py <dashboard-address>")
+        sys.exit(1)
+    address = sys.argv[1]
+    # Check if the address is a valid URL
+    result = urlparse(address)
+    if not all([result.scheme, result.netloc]):
+        print("Error: Invalid dashboard address. Please provide a valid URL.")
+        sys.exit(1)
+
+    print("Registering dashboard " + address + " on skein.")
+    app = skein.ApplicationClient.from_current()
+    app.ui.add_page("ray-dashboard", address, "Ray Dashboard")