In reality, I use artisan hand-crafted jails. When you've got 3 prod jails and a bunch of special-purpose carefully-tuned ephemeral testing ones, automation isn't useful.
If I needed many jails, I would look at tools.
Right after I wrote #fmjail, ix abandoned freebsd and stopped iocage development. IIRC, someone else picked it up but I'm not certain?
