render.yaml

services:
  - type: web
    name: my-app-name # the name of this service, you should change this
    runtime: docker # use Dockerfile for deployment
    plan: free # make sure to set this to free or you'll get billed $$$
    dockerfilePath: ./Dockerfile
    envVars: # this section sets some ENV variables needed by Render for deployment
      - key: SECRET_KEY_BASE
        generateValue: true
      - key: DATABASE_URL
        sync: false
      # Memory optimization for Render free tier (512MB RAM)
      - key: WEB_CONCURRENCY
        value: "1" # Single worker to fit in 512MB
      - key: RAILS_MAX_THREADS
        value: "3" # Cap threads to reduce memory
      - key: MALLOC_ARENA_MAX
        value: "2" # Reduce memory fragmentation
      - key: SOLID_QUEUE_IN_PUMA
        value: "true" # Run background jobs in same process
      - key: BUNDLE_WITHOUT
        value: "development:test" # Don't install dev/test gems in production