In OCP/K8S, projects run in the task pod's ee container. The private_data_dir is not extracted to /runner. Instead, the project update runs directly from the mounted in private_data_dir, e.g. /tmp/awx_1_abcd.
When injecting a credential that uses extra vars, we pass the private_data_dir as as the container_root, so that the correct command line argument is generated, e.g. "-e /tmp/awx_1_abcd/env/extra_var_file".
Signed-off-by: Seth Foster <fosterbseth@gmail.com>