Ensure build container cannot modify app dir for v3 brats [#160290732]
Ensure build container cannot modify app dir for v3 brats [#160290732]

Co-authored-by: Ben Fickes <b4731abca9c91b532f696cfd8fd7b4282be972df@pivotal.io>
Co-authored-by: Andrew Meyer <8f92422f5861fc9f31873f75dd770facd670512b@pivotal.io>

cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack,cloudfoundry/nodejs-buildpack