The installer script exits with code 8 on Ubuntu. Replace with manual
GPG key + apt source setup followed by apt-get install devkitpro-pacman.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>
Extracts toolchain setup into reusable composite actions under
.github/actions/. Comments out build-psp, adds build-gamecube-iso
job using the new setup-devkitpro action directly on the runner.
Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>