Determine linux RID's based on etc/os-release rather than dotnet --info
Determine linux RID's based on etc/os-release rather than dotnet --info

This gives us more control over which RID to use for linux distros.

OmniSharp/omnisharp-vscode,OmniSharp/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,OmniSharp/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,OmniSharp/omnisharp-vscode,seraku24/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,OmniSharp/omnisharp-vscode,gregg-miskelly/omnisharp-vscode,seraku24/omnisharp-vscode