Appears to bypass tools/bazel #35
Description
Builds were observed failing due to a variable defined in the script tools/bazel not being present in the environment. Builds outside of the bzl UI are working fine.
The default Bazel executable (a bash script) looks for tools/bazel (a Bazel wrapper, name can be different if BAZEL_WRAPPER is set) relative to the workspace root, deferring to it instead of a native binary (which it passes a reference to via BAZEL_REAL).