There are still remnants of the old build system (for example, the build derivations are not yet updated at all), but we'll get there.
(cherry picked from commit 086a81b7a5bbe1fc022efb5935ff68f6ad71ddaf)
git-subtree-dir: third_party/nix git-subtree-mainline: cf8cd640c1 git-subtree-split: be66c7a6b24e3c3c6157fd37b86c7203d14acf10
cf8cd640c1