Set TMPDIR env var to a temp dir
Set TMPDIR env var to a temp dir

Signed-off-by: Sai To Yeung <34863b63a003198e4cfe9dcefb53bc5c32a392d6@gmail.com>

cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,orange-cloudfoundry/buildpacks-ci,orange-cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci,orange-cloudfoundry/buildpacks-ci,cloudfoundry/buildpacks-ci