Running migrations without shell access

Hi folks,

Until my app is ready for primetime, I’m deploying on a shared server
without shell access. So I’m wondering how to create/modify my db
schema using migrations. I’m guessing I could create a method in a
controller that calls my Migrations classes, and just hit that URL to
migrate, but can’t seem to get that to work. Is there a stock/easy way
to do this?