maint(resources): test-bot does not pick up artifacts for Linux?

[mcdurdin]

See for example #15488

Trigger shows: https://build.palaso.org/buildConfiguration/Keyman_Test/603819?buildTab=log&focusLine=186&logView=flowAware&linesState=106 --> Linux test build was run

And we can see: https://build.palaso.org/buildConfiguration/KeymanLinux_TestPullRequests/603823?buildTab=artifacts