Codespaces: Auto-set WebAssembly app port to public

[Arlodotexe]

Problem

As stated in #19, Uno requires port 5000 to be made public to view the app in a Codespace. After much research, I wasn't able to find a way to automatically make this port public.

Solution

GitHub Codespaces appear to be in active development, with public ports only being added around March 2021. Since Uno requires port 5000 to be public for their WebAssembly app to run in a Codespace, this should be done automatically for user convenience.

[Arlodotexe]

Possibly useful: https://cli.github.com/manual/gh_codespace_ports_visibility

[michael-hawker]

Possibly useful: https://cli.github.com/manual/gh_codespace_ports_visibility

Could we add this to the VS Code launch config as a post-build/pre-debug command?

[Arlodotexe]

Could we add this to the VS Code launch config as a post-build/pre-debug command?

We wouldn't want this in the VSCode launch config since that would affect it outside codespaces, too. We'd need to add this to the devcontainer instead.

The gh cli method could work, only if they include it in codespaces out of the box (pre authenticated).