Let connected-24 tests fail.

Although these didn't used to fail at all, they now _always_ fail due to
the Docker setup we run on GitLab. Until we get that fixed, the CI is
not very helpful if it fails every time, and we merge anyway. This
allows us to at least correctly use the "Merge when succeeds" behaviour.

.gitlab-ci.yml

@@ -69,6 +69,7 @@ connected24:
         cat "$log" | curl --silent -F 'clbin=<-' https://clbin.com;
       done
     - exit $EXITVALUE
+  allow_failure: true
 
 after_script:
     # this file changes every time but should not be cached