GHA: run mkosi with sudo

Traceback (most recent call last):
  File "<frozen runpy>", line 198, in _run_module_as_main
  File "<frozen runpy>", line 88, in _run_code
  File "/home/runner/work/_actions/systemd/mkosi/bbe715f42911f9660712377a5b39335b9391ae22/mkosi/__main__.py", line 60, in <module>
    main()
  File "/usr/lib/python3.12/contextlib.py", line 81, in inner
    return func(*args, **kwds)
           ^^^^^^^^^^^^^^^^^^^
  File "/home/runner/work/_actions/systemd/mkosi/bbe715f42911f9660712377a5b39335b9391ae22/mkosi/__main__.py", line 52, in main
    run_verb(args, images)
  File "/home/runner/work/_actions/systemd/mkosi/bbe715f42911f9660712377a5b39335b9391ae22/mkosi/__init__.py", line 2789, in run_verb
    become_root()
  File "/home/runner/work/_actions/systemd/mkosi/bbe715f42911f9660712377a5b39335b9391ae22/mkosi/run.py", line 125, in become_root
    os.setresuid(0, 0, 0)
PermissionError: [Errno 1] Operation not permitted

Author: bluca

.github/workflows/mkosi.yml

@@ -138,7 +138,7 @@ jobs:
       run: mkosi summary
 
     - name: Build
-      run: mkosi --debug
+      run: sudo mkosi --debug
 
     - name: Boot systemd-nspawn
       run: test "$(sudo mkosi --debug boot 1>&2; echo $?)" -eq 123