`StopOnFirstFailure` when doing repository builds - avoids MSBuild continuing past failed repositories in sequential builds - ignored when building in parallel (unfortunately)
`StopOnFirstFailure` when doing repository builds
- avoids MSBuild continuing past failed repositories in sequential builds
- ignored when building in parallel (unfortunately)

aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore,aspnet/AspNetCore