debug-time-function-bodies is not enabled if multiple build actions are taken

[KingOfBrian]

I was tweaking our CI setup, and when my actions are clean build test, Danger wasn't able to find the debug information. It turns out that there are 3 .xcactivitylog files in the derivedData directory, and the wrong one is consistently picked. If I delete all but the largest log file, Danger reports things correctly.

I think I'm going to hack in a fix to my buildscript for now, as I've been in CI land for a bit too long, but thought I'd log the issue.