need to have mirror-registry.tar.gz in /output/mirror_registry

This was tested with a site.yaml

---
- name: test
strategy: debug
hosts: localhost
remote_user: root
vars:
- quay_host_ip: 10.15.69.148
- private_hostname: localhost
- quay_hostname: localhost
- json_pull_secret: /root/.docker/config.json
- oc_mirror_tar_output: /root/mirror_seq1_000000.tar
roles:
- mirror-registry