Xcode bot fails with "no activity for too long" error
This did the trick for us when we ran into the same issue today:
Created a new bot with exact configuration and that did the trick for me. Stackoverflow xcode-server-ibtool-build-failures
I created a new simple project to test Xcode Bot and the same problem happened.
I have try several ways including allow all items to access keychain, however, it didn't work until I unchecked the Code coverage.