Sets up Docker container, bind mounts and patches Ladybird scripts to allow both building and running the Ladybird web browser easily from any Linux distro, in a more reproducible and hermetic manner.
That would be nice, but I don't know nearly enough Nix and cmake to convert the Ladybird build process to Nix, nor do I know how to take the Ladybird package definition from nixpkgs and convert it to a suitable dev environment.
From the looks of it, it seems like the nixpkgs version patches a bunch of stuff to Ladybird to build it, which is fine (after all most Linux distros have some patches for programs for their own purposes), but for a dev environment it would be nice to start out from exactly the same code as everyone else, without any alterations.
The Docker based flow here only really requires a small modification to a support script, which is unlikely to be touched by most changes and is also restored back when the container is destroyed.
As for the flake, it installs stuff like just, gdb, and clangd, which is nice
for a) running the container script anywhere I'd like, b) debugging, and c) LSPing
my way through the source code.