Is the F-Droid build process currently broken?

Is there a way to automatically trigger a re-build on the official f-droid server for a unsuccessful build?

One of my apps has encountered a build failure because of an error either in the build server or the connection (as described in this post).
The search function in the wiki couldn’t find any other apps with the same error, so I suppose this is most likely a temporary issue (though the search function sometimes malfunctions – not returning all matches).

The problem may be related to SDK 27 on the f-droid build machine, since

  1. the build log yields problems related to SDK 27 (two logs with different problems)
  2. it happens on the first release (and the second) after switching to 27 (p.s. there isn’t a newer release yet, since I’m hoping to see the problem solved before relasing it)