C.UTF-8 for the win/AppImage build step: Wine's makensis was aborting with ERR_ELECTRON_BUILDER_CANNOT_EXECUTE / "main argv conversion failed!" under the runner's default C/POSIX locale. Gitea rejects secret names starting with GITEA, so the registry/API credentials are now BUILD_USER/BUILD_TOKEN. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>