Simple rc.d script to configure pot container on first boot
To configure container:
* Setup using `pot create`
* Populate `root/etc/rc.conf` (see below)
* Add any additional required files under `root` hierarchy
(eg. any commands referenced in `firstboot_pot_cmd`)
* From `root` dir copy-in files `cd root && pot copy-in -p <pot> -s . -d /`
* Boot container (for IPv6 alias containers may need delay to configure
interfaces - `pot set-cmd -p <pot> -c 'sleep 1 && /bin/sh /etc/rc'`)
# rc.conf variables
firstboot_pot_enable="YES"
firstboot_pot_ns="ns1 ns2..."
firstboot_pot_update="YES"
firstboot_pot_root_pk="ssh-ed25519..."
firstboot_pot_user="user"
firstboot_pot_user_pk="ssh-ed25519..."
firstboot_pot_pkgs="pkg pkg..."
firstboot_pot_cmd="cmd"