Making Bazel.git easier to build and test on non-Google RBE

[sluongng]

I have this stack of 3 PRs
#30298
#30299
#30300
which I am upstreaming from my fork.

The most interesting one among them would be #30299, which carves out a pattern to enable building and testing bazel.git on non-google RBE platforms.
My hope is that we can codify these execution requirements as constraints that RBE vendors can then supply their own exec platforms to match them.

Looking forward to hearing what the Bazel team has to say about this setup

You can find my actual fork here https://github.com/sluongng/bazel-rbe/commits/master/, where I have been using BuildBuddy RBE + Workflows to test Bazel.git since Dec 2025. Some interesting stats:

Last 7 days flake detection: