Hi, FYI: I'm able to run archive rebuilds on a quite regular basis. I do that to find (and file) FTBFS bugs, but it's also possible to test candidate changes in Debian (for example, new versions of compilers, interpreters, or other packages that are common build-depends).
If that's useful for you or your team, please get in touch with me. I'll ask you to provide: 1) a script that customizes a chroot. Examples are available at: https://salsa.debian.org/lucas/collab-qa-tools/-/tree/master/modes 2) a list of source packages to test-build. (if there are many of them and if it's not trivial to determine the exact set of packages to test-build, building all of unstable is of course possible) I usually factor a few of those rebuilds together, so you might have to wait a few weeks. There's some manual process involved, so please also provide a small explanation of why that's useful. Lucas