Add Dokku migration plan and SES/Cloudflare Terraform scaffolding#1

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nateberkopec wants to merge 3 commits intomasterfrom

feat/dokku-heroku-migration-terraform

Commits on Mar 2, 2026

Add Heroku→Dokku migration plan and SES/Cloudflare Terraform setup
nateberkopec
committed
Bump Ruby to 4.0.1 and enable jemalloc in Docker
nateberkopec
committed
Add docker-compose test runner with postgres and stripe-mock
nateberkopec
committed