How to install&compile bazel of arm64 at dockerfile?Confused me long time.

[MewemeW]

Hi emacski, I want to build a arm64 docker image of tf-serving, like you did.
I followed the instructions on tensorflow-serving
and stuck at bazel.
it shows that in dockerfile.devel, the version of bazel is x86. then I find arm64 version of bazel but it was not a .sh file.
how to install it then?
could you please enlighten me? many thanks.