Github has introduced Codepaces, which is really Visual Studio running in your own code container with the repository of your choosing. It looks and reacts just like VScode, and has all the languages and frameworks available like VScode. For example, Python, Jscript, Django, Typescript, GO, C#, C++, and so on. Since you have your own Ubunto Linux shell version 20.04 I decided to test Powershell 7.3, and see how it run in the Linux environment. Below are the steps and are supported for Ubuntu V20.04.
wget -q https://packages.microsoft.com/config/ununtu/$(lsb_release-rs)/packages-micros
dpkg -i packages-microsoft-prod.deb
apt-get update -y
apt-get install powershell -y
pwsh
You still need to install the Powershell extension on CodeSpaces.
Cheers, Joseph
puffycloud@zohomail.com