[Bazel Examples CI] No WORKSPACE file found, Error computing the main repository mapping

[satyanandak]

CI: https://buildkite.com/bazel/bazel-bazel-examples/builds/4549#01987797-3e38-42d4-bad7-0f5c511f84f0

Platform: MacOS, Ubuntu, Windows

Logs:

ERROR: <builtin>: fetching local_repository rule //:lib_a~override: java.io.IOException: No WORKSPACE file found in /private/var/tmp/_bazel_buildkite/a730b7ca16c834555388d9a5ab181faa/external/lib_a~override
ERROR: Error computing the main repository mapping: unknown error during computation of main repo mapping 

CC Greenteam @Wyverald