CI actions are 'successful' despite failing and produce incomplete artifacts

[mitchcapper]

As long as there is any file in the .NET x86/64 and framework output directories it is considered a build success. As that folder is populated incrementally this leads to failed builds passing. It also generates artifacts with missing files (as not everything compiled).

The fail check is:
https://github.com/dnSpyEx/dnSpy/blob/master/.github/workflows/build.yml#L45

and a sample failed build: https://github.com/dnSpyEx/dnSpy/actions/runs/2189103079

[ElektroKill]

Hi, thanks for bringing this to my attention. I had no clue such a problem existed since I almost never use the builds provided by the CI myself, especially for the ILSpy v7 port branch. To be completely honest, the CI workflow was made by the previous developer of dnSpy and I have not touched it much due to my very limited experience with GitHub Actions and PowerShell scripts. If you have a potential solution in mind feel free to open a PR to the master branch to get this fixed, if you don't then I will probably do it later this week if I find the time for it (it's holiday time here in Poland and I won't be home for the majority of the week).