[build-tools] automatially parse Xcode logs in search for 'error: ' logs to make debugging build failures easier for user

[szdziedzic]

Why

Talked about it with @lukmccall today. We want to improve our old generic error message which we display when the build fails during the RUN_FASTLANE phase that says The "Run fastlane" step failed with an unknown error. Refer to "Xcode Logs" below for additional, more detailed logs. to make it more informative by parsing Xcode logs for the user and displaying found errors in the error message itself so it is easier to find them.

How

Add a new user error handler for XCODE_BUILD_PHASE. If this error handler finds error: ... logs in the Xcode build logs file, it displays them nicely in the user-facing error message.

Similar to: #148

Test Plan

Added automated tests

[szdziedzic]

• [build-tools] automatially parse Xcode logs in search for 'error: ' logs to make debugging build failures easier for user #471 👈 (View in Graphite)
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