`create_sdk` target broken on non-Debian Linux distributions

[ntkme]

Dart SDK fails to build on all Linux other than Debian-like ones due to the unavailability of dpkg-buildpackage command, since this recent commit on main branch: efda4af

Example:
https://github.com/dart-musl/dart/actions/runs/12758764594/job/35561520866

tools/debian_package probably should not be a dependency of create_sdk, because it won’t build on anything other than Debian-like. It’s better to create a different top level target to do this.

[ntkme]

cc @rmacnak-google @athomas

[dart-github-bot]

Summary: The create_sdk target in the Dart SDK build process fails on non-Debian Linux distributions due to a dependency on dpkg-buildpackage. A solution is needed to decouple Debian-specific packaging from general SDK creation.

[ntkme]

Fixed with with 52cc629

Build is passing now: https://github.com/dart-musl/dart/actions/runs/12771750249/job/35605868415