We now use our buildthings build backend for Review Board. This gives us

the ability to set up editable installs and build packages against local

development packages with ease, and to introduce build steps necessary

for Review Board.
This improves upon the in-tree build backend, which buildthings was

built upon. Although that supported local packages for install-time

dependencies, it didn't support dev dependencies, which was a problem

for some of our packages that forked the backend.
Right now, all build types support local packages, since we need to run

Review Board scripts as part of build generation and that requires

in-development versions of Djblets and other libraries.
We also need to build media assets for both sdist and wheels. Now, best

practices are to avoid this for wheel builds in order to keep builds

reproducible, but that's a larger task and no different than it's been.

We can work toward it in the future.

Installed in editable mode.
Deployed the current version of reviews.reviewboard.org from this

change.