A config setting to prevent automatic mounting onto `primary` interface

[flying-sausages]

What are you trying to do?
I will often try to spin up a primary instance for a quick one-off purpose, while my named instances have designated tasks. This means that my Primary instance does not need to mount the filesystem of the host at all, which slows down the instantiation process. I don't think there are cloud-init options to disable this.

What's your proposed solution?
It would be nice to offer more configuration over the automatic mounting features with the following settings for example:

• Stop primary from auto-mounting
• Set which directory/directories should be auto-mounted instead of thee default homedir/primary volume
• Enable auto-mount on all/non-primary instances

Additional context
n/a