Deploy Medusa-Next.js Stack

I’m looking to get my full MercurJS commerce stack up and running on DigitalOcean’s App Platform. The project is made up of three containerised parts:

• an API backend built on Medusa (Node.js)
• a public-facing Next.js storefront
• a React-based vendor panel

Everything is already in a Git repository; what I need now is a clean deployment workflow on DigitalOcean that covers:

1. Container build & deploy for each service on the App Platform (not a droplet).
2. Environment variable setup and secret handling.
3. Automatic HTTPS and custom-domain routing for the storefront and vendor panel.
4. Connection of the Medusa API to an existing Postgres database.
5. Simple CI/CD so each push to main triggers a fresh build.

If you’ve shipped Node.js or Next.js applications on DigitalOcean’s container service before, this should feel familiar. Please let me know roughly how you’ll structure the apps, handle build commands and any tweaks you’d make for smooth scaling.