[ci] Execute build.ps1 from bash on Mac to avoid STDIO streams hang #19257
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Description of Change
This is to address a reliability issue involving
MAUI-DeviceTests
. Tests run on Mac sporadically hang then fail (timeout) due to the following error:It seems that build.ps1 is getting executed as a powershell subprocess and in turn interfering with the IO stream for the pwsh step. As a mitigation, run build.ps1 under a bash step on Mac. This avoids flakiness and in turn avoids having to rerun failed tests.