Add VSCodium via apt

VSCodium installed as per Add apt signing keys to debian, the right way.

wget -qO - https://gitlab.com/paulcarroty/vscodium-deb-rpm-repo/raw/master/pub.gpg |\
  gpg --dearmor |\
  sudo dd of=/usr/share/keyrings/vscodium-archive-keyring.gpg

echo 'deb [signed-by=/usr/share/keyrings/vscodium-archive-keyring.gpg] https://download.vscodium.com/debs vscodium main' |\
  sudo tee /etc/apt/sources.list.d/vscodium.list