vscodium in flatpak golang not found

Install SDK extensions:

flatpak install flathub org.freedesktop.Sdk.Extension.golang

and then set env variable `FLATPAK_ENABLE_SDK_EXT`:

#in fish in ~/.config/fish/config.fish
set -U FLATPAK_ENABLE_SDK_EXT 'golang'

https://gist.github.com/pojntfx/2e1ea30df020924e5d40f823adc6ae09