packer supports clouds.yaml configuration:

https://www.packer.io/docs/builders/openstack.html

We don't need to maintain a separate cloud-env file containing duplicate credentials. Instead packer jobs should be updated to utilize the clouds.yaml instead. We can simplify clouds-env to be just 2 parameters:

{
  "cloud_network": "721d9298-2678-494b-9414-43711b340049",
  "ssh_proxy_host": "localhost"
}

This allows us to deduplicate configuration and reuse standard config elsewhere.