[Feature] Optionally mount home as overlay

[89luca89]

It could be useful to mount the home as overlay, for example while using the custom home functionality, so that we are sure that the home is not touched outside the container.

This is also useful for #28

Example:

distrobox create --image alpine:latest --name test-alpine --home /tmp/test-home --overlay-host-home

Specifically the home should then be mounted with the :O flag:

[...]
		--volume ${container_user_home}:${container_user_home}:O
[...]

[89luca89]

Closing this
It doesn't make a lot of sense nor in sanboxing optic, nor in normal usage