is there an API to spin up instances on demand? we currently have a single tenant architecture so it would be pretty useful if we could spin up an instance when a user sings up for a specific tier, I know some platfoms like digital ocean have somehting like this, however I want to use supabase. in that note, could I also run a shell script to make a template of sorts wiht this new machine?

This is something we are working on but it hasn't been released yet. It's in the pipeline, though.