Hi Kouhei,
First, ray is build with bazel. However, it has strict version dependencies with bazel it self, and it download source code from the Internet. Copy the code by hand might not be a big issue, but the Bazel version is critical for me. I'm struggling with this problem almost all week....
I've been warned that packaging Jax for Debian is likely to be quite difficult for the same reason. If you overcome this problem, I would certainly be interested in your solution.
Sincerely,
Cory Bloor