CHANGES WITH 48:
- skopeo stage: remove overlay/backingFsBlockDev file after install (#970)
- Add support for embedding containers in images (#952)
- Initial work on more reproducible builds (#962)
- Bootiso: add the option to compress using lz4 (#951)
- runners: add rhel-87 (#963)
Contributions from: Alexander Larsson, Christian Kellner, Jakub Rusz, Ondřej Budai, Roy Golan, Thomas Lavocat, jkozol
— Berlin, 2022-02-16