Why:

Bazel is a project used to build software and in the context of AIPCC, Bazel would be used to build multiple packages like Tensorflow, Torch XLA, etc (projects maintained by Google mainly). However each project requires a specific version of Bazel, often documented in their build process. e.g. 
 
https://www.tensorflow.org/install/source#tested_build_configurations 
 
What:
Being able to install multiple versions of Bazel, in a secure way, without relying directly on the public binaries. We'd probably want to build Bazel from source and ship it via RPMs as we did in the past but a given version, or explore other ways to do it.
 
How:
TBD , via an ADR