Update to test on Alpine 3.10 for 2.x

[mthalman]

Now that Alpine 3.10 has been released, testing should be updated to include that version. Also, be sure to check that the CI build is using 3.10 as well. This is specific to 2.x servicing.

Related to https://github.com/dotnet/corefx/issues/38027

[ViktorHofer]

@danmosemsft do we want that for 2.x?

[ViktorHofer]

cc @terrajobst

[MichaelSimons]

FWIW, the OS support policy for 2.x states Alpine 3.7 + is supported.

https://github.com/dotnet/core/blob/master/release-notes/2.1/2.1-supported-os.md
https://github.com/dotnet/core/blob/master/release-notes/2.2/2.2-supported-os.md

[mthalman]

@ViktorHofer, @danmosemsft, @terrajobst - Can we get some traction on this? This is blocking the release of Docker images on this version.

[terrajobst]

@richlander would be better suited to respond.

[ViktorHofer]

Rich, please let us know if we should do this for the release branches:

It is both adding the RID and validating via a new CI leg.

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[richlander]

Yes. We will need to do this several more times with 2.1. Expect us to ask at least every 6 months to adopt a new Alpine.

[richlander]

Do we need a new RID? Thought we just used linux-musl.

[MichaelSimons]

In the past we have always had version specific rids. It appears that the rid changes were already made sometime ago - dotnet/corefx@ad01284

[richlander]

I see ... so we have both the general ones and the specific ones? I didn't know that. I always use the general one (like linux-musl-x64), but I can see the role for the specific ones.

[MichaelSimons]

See dotnet/dotnet-docker#1374 for the importance of why Alpine 3.10 support is critical.

[richlander]

Sure, but that doesn't explain why the RID is important. I'm not pushing back on the RID, just saying that the RID choice and supporting 3.10 don't relate directly.

[ViktorHofer]

Done.