Game Version number: Current stable / Experimental
Modded?: Yes
If modded, please list the mods: N/A

Issue Description:

While trying to use Workbench in Continous Integration in ACE we've found out that the tools do not return error exit codes (always 0) while packing addons with errors that prevent the game from compiling ((E): Can't compile "Game" script module!).

This makes them not really that useful in for example detecting errors in Pull Requests or preventing auto-upload of broken build to Workshop.

Would be nice to have some insights from BI how the CI/CD is handled internally.