Users of Podman machine (Podman Desktop users too) find it difficult to put things like certificates onto the machine operating system.  We should find a way that during podman machine init, files like certificates, or anything really, can be added to the machine in some sort of host_file:remote_file sort of approach.

I think ignition can help us here.

QE ideas for `podman machine init --playbook`:

• Use a playbook to download a certificate from a server (like in this blog)
• Use a playbook to create a series of files and directories

QE ideas for `podman machine cp`:

• copy a directory from the host to the guest
• copy a directory from the guest to the host
• copy a file from the host to the guest
• copy a file from the guest to the host
• copy a file or directory between two machines (should fail)
• copy a file or directory without specifying a machine as the source or destination (should fail)
• copy a file to a read-only directory (should fail)