installer's HostMachineRidTargetsDebianPackages should check for Debian in a better way

[eerhardt]

Instead of hard-coding a couple RIDs to see if the host machine is "debian based":

runtime/src/installer/Directory.Build.props

Lines 304 to 309 in 5f09f33

	<HostMachineRidTargetsDebianPackages Condition="
	$(HostMachineRid.StartsWith('debian')) or
	$(HostMachineRid.StartsWith('ubuntu')) or
	$(HostMachineRid.StartsWith('linuxmint'))">true</HostMachineRidTargetsDebianPackages>
	<!-- If the build machine isn't known to be Debian-based, try to build RPM packages. -->
	<HostMachineRidTargetsRpmPackages Condition="'$(HostMachineRidTargetsDebianPackages)' != 'true'">true</HostMachineRidTargetsRpmPackages>

We should instead use a more proper way of checking for Debian systems.

One example would be to check for the existence of /etc/debian_version. See #35538 (comment).

fyi - @jkotas @ViktorHofer

Tagging subscribers to this area: @safern, @ViktorHofer
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[NikolaMilosavljevic]

[Triage] This would affect source-building .NET in Debian family of distros.