https://github.com/bazelbuild/bazel-toolchains is a repository where Google hosts Bazel toolchain configs. These configs are required to configure Bazel to issue commands that will execute inside a Docker container via a remote execution environment.
These toolchain configs include:
Release information of toolchain configs can be found at: https://releases.bazel.build/bazel-toolchains.html.
This repository also hosts the skylark rule used to generate toolchain configs.
This repo previously contained Bazel targets that are used to generate toolchain containers. Note that they have been migrated to the following two repos: