Doc Enhancement - Explain what operations require root

[DanielYWoo]

Currently the doc says

skopeo does not require the user to be running as root to do most of its operations.

We are very interested in this for security reasons, but we don't fully understand what "most" means, can you improve the doc a little bit to explain what operations are required running with root?

[mtrmac]

Thanks for reaching out.

I think the short version is “depending on the transport and parameters chosen”, e.g. using docker-daemon: might require access to a root-owned socket, or the machine-wide containers-storage: store is root-owned. I don’t know that we have a comprehensive documentation of the details.

Or, to say it another way, looking at the list of subcommands/operations implemented by Skopeo, nothing in there structurally, always requires privileges.