* e2e: add tests for using private registry with podman driver
This PR adds e2e tests that stands up a private docker registry
and has a podman tasks run a container from an image in that private
registry.
Tests
- user:password set in task config
- auth_soft_fail works for public images when auth is set in driver
- credentials helper is set in driver auth config
- config auth.json file is set in driver auth config
* packer: use nomad-driver-podman v0.5.0
* e2e: eliminate unnecessary chmod
Co-authored-by: Daniel Bennett <dbennett@hashicorp.com>
* cr: no need to install nomad twice
* cl: no need to install docker twice
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Co-authored-by: Daniel Bennett <dbennett@hashicorp.com>
