Pass hostname to auth token request

Related to T56381

benchmark/submission/client.py

@@ -7,7 +7,7 @@ import urllib.parse
 
 import requests
 
-from . import timeouts, exceptions
+from . import timeouts, exceptions, sockutil
 
 log = logging.getLogger(__name__)
 
@@ -137,7 +137,10 @@ class BenchmarkClient:
 
         self._start_http_server()
 
-        params = urllib.parse.urlencode({'auth_callback': self.auth_http_server.auth_callback_url})
+        params = urllib.parse.urlencode({
+            'auth_callback': self.auth_http_server.auth_callback_url,
+            'hostname': sockutil.hostname(),
+        })
         url = f"{self.url_generate_token}?{params}"
 
         if not webbrowser.open_new_tab(url):

benchmark/submission/sockutil.py

@@ -56,3 +56,7 @@ def find_free_port(start_address):
         port_nr += 1
 
     return hostname, port_nr
+
+
+def hostname() -> str:
+    return socket.gethostname()