There was a problem with the Docker image used on emba.gnu.org, causing
all builds to fail.

I've resolved that, and the failures now are legit:

SUMMARY OF TEST RESULTS
-----------------------
Files examined: 233
Ran 3267 tests, 3136 results as expected, 5 unexpected, 126 skipped
4 files contained unexpected results:
  lisp/url/url-tramp-tests.log
  lisp/play/morse-tests.log
  lisp/image-tests.log
  lisp/autorevert-tests.log
  
https://emba.gnu.org/emacs/emacs/-/jobs/2143/raw

-- 
Toon