message: getdeps: disable ccache on sandcastle
  Summary:
  We sometimes see some flakeyness in our internal CI, so we can live
  without it there.
diff: @@ -271,6 +271,10 @@ class CMakeBuilder(BuilderBase):
  "CMAKE_BUILD_TYPE": "RelWithDebInfo",
  }
  env = self._compute_env(install_dirs)
  + if "SANDCASTLE" not in os.environ:
  + # We sometimes see intermittent ccache related breakages on some
  + # of the FB internal CI hosts, so we prefer to disable ccache
  + # when running in that environment.
  ccache = path_search(env, "ccache")
  if ccache:
  defines["CMAKE_CXX_COMPILER_LAUNCHER"] = ccache
  