Add RID for Linux/ARM32 (ubuntu)

[hseok-oh]

Add RID for Linux/ARM32 - ubuntu*-arm

related PR: dotnet/coreclr#8421

[dnfclas]

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[dnfclas]

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[stephentoub]

cc: @ericstj, @mellinoe, @ellismg

[mellinoe]

Looks good to me. Could you also add extra entries for Linux Mint? We consider it binary-compatible with Ubuntu.

[hseok-oh]

@mellinoe I don't have environment that installed Linux Mint, so I don't know proper RID for Linux Mint.

[ellismg]

I don't believe there is actually an ARM version of Mint (even with it being downstream of Ubuntu). There's now download link on linuxmint.com and the forums imply that there is no ARM version.

[mellinoe]

Good point, @ellismg . That was a bad assumption on my part. The rest of this looks good to me.