Add vsdbg to Linux Repositories

Please add vsdbg to your Linux repositories. Currently to remotely debug my ARM targets I need to install vsdbg with something like:

```
wget https://aka.ms/getvsdbgsh
chmod +x getvsdbgsh
sudo ./getvsdbgsh -v latest -l /opt/Microsoft/vsdbg
```

It would be much nicer if we could just do `sudo apt install vsdbg` along with the `dotnet-sdk` and `dotnet-runtime` packages.