What's Changed
* Allow setting variables when using system packages by TimoWilken in https://github.com/alisw/alibuild/pull/795
* Warn about uncommitted files in final summary by ktf in https://github.com/alisw/alibuild/pull/798
* Make test_git work for privileged users by ktf in https://github.com/alisw/alibuild/pull/805
* Improve test support by ktf in https://github.com/alisw/alibuild/pull/806
* Abstract away SCM integration by ktf in https://github.com/alisw/alibuild/pull/803
* Add support for rhel9 by Barthelemy in https://github.com/alisw/alibuild/pull/808
* Use registry.cern.ch for Docker images by default by TimoWilken in https://github.com/alisw/alibuild/pull/793
* Add support for sapling by ktf in https://github.com/alisw/alibuild/pull/804
**Full Changelog**: https://github.com/alisw/alibuild/compare/v1.14.6...v1.15.0