Release 6.6

- Specify full URL policy when mirroring screenshots
- Fix restore cache keys to actually include arch

Git-EVTag-v0-SHA512: ca6fbc7d329ce5b12941d43784e75877e0a65961522be9f01b2df1ccd6025d5fd700c40a6c30d85cb8b1e092f5f11865f346b183af8cdf050e10ec5c0a2eed0b

Re-tag v6 to v6.6

Release 6.5

flat-manager: Add support for --build-log-url

README: Stop suggesting v6.1

As we re-tag whenever a minor release happens

misc: Update deps & regenerate

Add a build-bundle option

Release v4

This release introduces building for cpu architectures other than x86_64

README: use tagged release