Create .rpm's for Linux Mariner

[wtgodbe]

Fixes #35725 (will need to be backported to 6.0)

We don't use the Arcade Installers package to generate these, so need to roll our own solution. I just copy the existing .rpm's with the new name (which is what Arcade does too: dotnet/arcade#7812).

Test build: https://dev.azure.com/dnceng/internal/_build/results?buildId=1338101&view=results

[wtgodbe]

Test job produced and published:

aspnetcore-runtime-7.0.0-alpha.1.21452.9-x64.rpm
aspnetcore-runtime-7.0.0-alpha.1.21452.9-cm.1-x64.rpm
aspnetcore-targeting-pack-7.0.0-alpha.1.21452.9.rpm
aspnetcore-targeting-pack-7.0.0-alpha.1.21452.9-cm.1.rpm

[wtgodbe]

/backport to release/6.0

[github-actions]

Started backporting to release/6.0: https://github.com/dotnet/aspnetcore/actions/runs/1195750434

[dougbu]

This works but, if I may ask, why not calculate $(CblMarinerTargetPath) in the Directory.Build.targets file❔ Property functions should make it easy to split out the parts and reassemble them w/ -cm1-x64 inserted.

[wtgodbe]

Property functions should make it easy to split out the parts and reassemble them w/ -cm1-x64 inserted.

True, but I think it's more readable to set them literally, plus it matches what we were already doing with TargetPath and TargetFileName

[wtgodbe]

/backport to release/5.0

[wtgodbe]

/backport to release/3.1

[github-actions]

Started backporting to release/5.0: https://github.com/dotnet/aspnetcore/actions/runs/1266977545

[github-actions]

Started backporting to release/3.1: https://github.com/dotnet/aspnetcore/actions/runs/1266977708