Archive `init-tools.log` in CI builds (#1102)
Archive `init-tools.log` in CI builds (#1102)

This will make it easier to diagnose CI build failures that happen during
init--currently there's a message printed to stderr that says to look at a
file that's already deleted.
jeffkl/msbuild,AndyGerlicher/msbuild,mono/msbuild,chipitsine/msbuild,mono/msbuild,AndyGerlicher/msbuild,cdmihai/msbuild,AndyGerlicher/msbuild,chipitsine/msbuild,AndyGerlicher/msbuild,chipitsine/msbuild,cdmihai/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,rainersigwald/msbuild,rainersigwald/msbuild,sean-gilliam/msbuild,mono/msbuild,chipitsine/msbuild,Microsoft/msbuild,rainersigwald/msbuild,Microsoft/msbuild,cdmihai/msbuild,sean-gilliam/msbuild,Microsoft/msbuild,jeffkl/msbuild,sean-gilliam/msbuild,Microsoft/msbuild,cdmihai/msbuild,jeffkl/msbuild,mono/msbuild,jeffkl/msbuild