Observability: Docker compose for Loki, Promtail and Grafana

x-logging: &default-logging
  driver: "json-file"
  options:
    max-size: "10m"
    max-file: "3"
    tag: "{{.ImageName}}|{{.Name}}|{{.ImageFullID}}|{{.FullID}}"

dashboard-frontend:
  build:
    context: ./frontend
    dockerfile: Dockerfile
    args:
      - VITE_API_BASE_URL=https://${API_BASE_URL}/api
      - VITE_PARTICIPANT_BASE_URL=https://${PARTICIPANT_BASE_URL}
      - VITE_BUILD_VERSION=${BUILD_VERSION}
      - VITE_USE_PARTICIPANT_ROUTER=0
  restart: unless-stopped
  depends_on:
    - api-server
  logging: *default-logging

promtail:
  image: grafana/promtail:2.8.0
  volumes:
    - /var/lib/docker/containers:/var/lib/docker/containers:ro
    - /var/run/docker.sock:/var/run/docker.sock
    - ./promtail-config.yaml:/etc/promtail/config.yaml
  command: -config.file=/etc/promtail/config.yaml
  networks:
    - default

loki:
  image: grafana/loki:latest
  restart: unless-stopped
  networks:
    - default
  volumes:
    - loki_data:/loki
  command: -config.file=/etc/loki/local-config.yaml

grafana:
  image: grafana/grafana:latest
  restart: unless-stopped
  entrypoint:
    - sh
    - -euc
    - |
      mkdir -p /etc/grafana/provisioning/datasources
      cat <<EOF > /etc/grafana/provisioning/datasources/ds.yaml
      apiVersion: 1
      datasources:
        - name: Loki
          type: loki
          access: proxy
          url: http://loki:3100
      EOF
      /run.sh
  ports:
    - "3000:3000"
  networks:
    - default
  volumes:
    - grafana_data:/var/lib/grafana
  depends_on:
    - loki

volumes:
  loki_data:
  grafana_data:

networks:
  default:
    driver: bridge