[ArPow] Run source-build leg in official builds

[MichaelSimons]

This is required in order to publish the Microsoft.SourceBuild.Intermediate.roslyn NuGet package so that it can be referenced by downstream dependent repos that participate in source-build.

ArPow CI onboarding describes what Arcade templates exist to support this.

[MichaelSimons]

@JoeRobich - This is blocking the ArPow work, can this get fixed before .NET Preview 6 release branch snap and build which starts on 15-Jun?

[RikkiGibson]

Is this referring to the same thing as the source build leg that we already run in roslyn-ci?

[MichaelSimons]

Yes, the source build leg that is run in PR validation should get run in the internal ci / official builds and the resulting Microsoft.SourceBuild.Intermediate NuGet package needs to get published to BAR. The source-build template should handle all of this.

[JoeRobich]

@MichaelSimons Does this build give you what you need? If so then we can move forward with PR #54009

[JoeRobich]

@MichaelSimons It helps if I link to the build - https://dev.azure.com/dnceng/internal/_build/results?buildId=1182202&view=results

[MichaelSimons]

Yep that looks correct, thanks. The only thing to verify with a full build is that the Microsoft.SourceBuild.Intermediate.roslyn..nupkg that gets produced in the source-build leg gets published to BAR.

[JoeRobich]

Reopening until we confirmed publishing

[MichaelSimons]

I verified the Microsoft.SourceBuild.Intermediate.roslyn..nupkg is now getting published to BAR by the official builds. Thanks @JoeRobich