[Ubuntu] Support .net 7

[HarelM]

Hi,

I'm trying to run my build which I recently upgraded to .net 7 but it fails on ubuntu.
I'm guessing the image doesn't have .net 7 from the error message.
I don't know if this is planned or not, but it would be great to have .net 7 on the next ubuntu image.

Thanks for all the great work you guys are doing!!

Relevant build for examle:
https://ci.appveyor.com/project/IsraelHikingHost/site/builds/45796525/job/f7qjsku80cwcx4y1

[FeodorFitsner]

We are going to update Ubuntu images shortly.

[HarelM]

Thanks @FeodorFitsner !!

[HarelM]

As a workaround, I was able to run the following command as part of the install phase: sudo apt-get update && sudo apt-get install -y dotnet-sdk-7.0
So, from my point of view, this is not urgent.