F-droid failing to build versions after 3.3.12

[code-consensus]

What happened?

I couldn't help but notice that the app hasn't been updated F-droid beyond 3.3.12 two months ago. Version 3.3.13 from January didn't get pushed through, nor the latest v3.3.14 from two weeks ago.

Steps to reproduce the problem

I don't understand the f-droid build process at all, but I note this page here mentions some kind of "pipeline: failed" error:
https://gitlab.com/fdroid/checkupdates-bot-fdroiddata/-/commits/com.streetwriters.notesnook

Version

v3.3.12

Platform/OS

Android

Relevant log output