FreeBSD support

[asomers]

Describe the enhancement
Support building the runner on FreeBSD

Additional information
I think FreeBSD has all the libraries that the runner needs. And while the dotnet-sdk isn't availble from Microsoft, there is already a package for it: lang/linux-dotnet-sdk . So it should be possible to build the runner on FreeBSD.

[TingluoHuang]

We can't really do that for mainly 2 reasons.

• Supportability, without office support from dotnet core team, debugging any native dependency problem will be a nightmare.
• Legal, we (GitHub) might run into legal problem when we consume and redistribute 3rd party open source project.

But, we are totally fine with forking this repository and try yourselves, we are generally doing do on holding server/client compat.

Hope this can help. 😄

[Crow-Control]

Addition:
lang/linux-dotnet-sdk is based on a very old version. Considering the DotNet Core team is working on version 5 by now, I doubt anyone is willing to spend time debuging it, as @TingluoHuang explained.

[TingluoHuang]

We can add support if we do #243 or Dotnet 5 supports FreeBSD

[neilpang]

Sorry to bother you.
but I just created an action to make it possible to use FreeBSD in your workflow.

https://github.com/vmactions/freebsd-vm