docker-compose.yml

services:
  tdd:
    build:
      context: .
    depends_on:
      - lgtm
      - postgres
    ports:
      - 4000:4000 # Web
    environment:
      - PHX_HOST=localhost
      - PORT=4000
      - SECRET_KEY_BASE=ZOO9B3CQWdK/kjQmEFmvukqaXkcFpaH7AJItXjBVADrmMPiNr0ETM28TmH1/xVXj
      - DATABASE_URL=postgres://postgres:postgres@postgres:5432/postgres
      # https://hexdocs.pm/opentelemetry_exporter/readme.html#os-environment
      - OTEL_EXPORTER_OTLP_PROTOCOL=http/protobuf
      - OTEL_EXPORTER_OTLP_ENDPOINT=http://lgtm:4318

  # LGTM includes a collector, so we don't follow example in OTel docs:
  # https://opentelemetry.io/docs/languages/erlang/exporters/#setting-up-the-collector
  lgtm:
    image: grafana/otel-lgtm:0.11.5
    ports:
      - 3000:3000 # Grafana UI
      - 4317:4317 # OTLP gRPC
      - 4318:4318 # OTLP HTTP
    volumes:
      - lgtm_data:/data
    environment:
      # https://github.com/grafana/docker-otel-lgtm/#configuration
      - ENABLE_LOGS_ALL=true

  postgres:
    image: postgres:17
    ports:
      - 5432:5432
    volumes:
      - postgres_data:/var/lib/postgresql/data/
    environment:
      POSTGRES_PASSWORD: postgres

volumes:
  lgtm_data:
  postgres_data: