cmdtest: forward PATH env
cmdtest: forward PATH env

without this, running docker-compose in a Concourse task would fail with
a cryptic error:

  [2558] Cannot open self /tmp/build/e55deab7/concourse/integration/ops/docker-compose or archive /tmp/build/e55deab7/concourse/integration/ops/docker-compose.pkg

Signed-off-by: Alex Suraci <925ba519bbf1a06224928b692ef88b93aee946af@gmail.com>
Co-authored-by: Rui Yang <4d6b7b1f23ec6027b801cceb8a18a6505e32557e@vmware.com>

concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse,concourse/concourse