Don't run tests in bootstrap build
Don't run tests in bootstrap build

We only really need to run tests once in a CI build, and it's best placed
at the end of the built-with-the-very-latest post-bootstrap build. To save
time, I'm skipping tests in the bootstrap build.

mono/msbuild,Microsoft/msbuild,chipitsine/msbuild,Microsoft/msbuild,cdmihai/msbuild,chipitsine/msbuild,mono/msbuild,jeffkl/msbuild,Microsoft/msbuild,AndyGerlicher/msbuild,mono/msbuild,AndyGerlicher/msbuild,rainersigwald/msbuild,jeffkl/msbuild,chipitsine/msbuild,sean-gilliam/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,AndyGerlicher/msbuild,mono/msbuild,Microsoft/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,rainersigwald/msbuild,chipitsine/msbuild,rainersigwald/msbuild,jeffkl/msbuild,jeffkl/msbuild,rainersigwald/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,sean-gilliam/msbuild