Flutter can't cross-compile, so arm64 builds in an arm64 Fedora under the
runner's QEMU emulation, with its own SDK (the release tarball's Dart SDK
is x64, so arm64 fetches its own). quine-linux's arm64 image installs it.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
packaging/ builds it in a Fedora container and makes an RPM;
.forgejo/workflows/rpm.yml runs that on each push to main and uploads it
to the forge's quine RPM group, which quine-linux's image installs from.
Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
