rebuilderd 0.16.3 released

[kpcyrd]

hi!

I've released rebuilderd v0.16.3, this release is mostly refactoring to
support "build groups", meaning it's now possible to have one build
reproduce multiple artifacts at once.

The full changelog for the 0.16.x series can be found at:

https://github.com/kpcyrd/rebuilderd/releases/tag/v0.16.3
https://github.com/kpcyrd/rebuilderd/releases/tag/v0.16.2
https://github.com/kpcyrd/rebuilderd/releases/tag/v0.16.1
https://github.com/kpcyrd/rebuilderd/releases/tag/v0.16.0

Known public instances are now collected on this website:

https://rebuilderd.com/

cheers,
kpcyrd