services:
  postgres-18-alpine:
    container_name: postgres-18-alpine
    image: postgres:18-alpine
    restart: "no"
    environment:
      # No real data lives here - a thin self-hosted-registry mirror build
      # target so other stacks can pull the result. trust auth is fine
      # since nothing reaches it but the health check below - Postgres
      # refuses to start at all without some password/auth method set.
      - POSTGRES_HOST_AUTH_METHOD=trust
    healthcheck:
      test: ["CMD-SHELL", "pg_isready -U postgres"]
      interval: 5s
      timeout: 5s
      retries: 10
      start_period: 10s