dotnet-sdk-3.1 fails docker build

[electricgull]

dotnet-sdk-3.1 fails docker build. Dotnet needs to be updated to dotnet-sdk-6.0 and use the new install scripts per:

https://learn.microsoft.com/en-us/dotnet/core/install/linux-ubuntu#2004
https://learn.microsoft.com/en-us/dotnet/core/install/linux-scripted-manual#scripted-install

codeql-container/Dockerfile

Line 50 in 4632664

RUN apt-get install -y dotnet-sdk-3.1

[sargemonkey]

Agree, need to apply the fix