version: '2.1'

services:
  app:
    build: .
    restart: unless-stopped
    env_file: .env
    command: gulp watch
    volumes:
      - ./www/img:/opt/app/www/img
      - ./www/js:/opt/app/www/js
      - ./www/templates:/opt/app/www/templates
      - ./www/dist:/opt/app/www/dist
      - ./gulp:/opt/app/gulp
      - ./releases:/opt/app/releases

      - ./google-services.json:/opt/app/platforms/android/google-services.json
      - ./eff-alerts.keystore:/opt/app/eff-alerts.keystore
    ports:
      - '4001:4001'

version: '2.1'

services:
  app:
    build: .
    restart: unless-stopped
    env_file: .env
    command: gulp watch
    volumes:
      - ./config:/opt/app/config
      - ./www/img:/opt/app/www/img
      - ./www/js:/opt/app/www/js
      - ./www/templates:/opt/app/www/templates
      - ./www/dist:/opt/app/www/dist
      - ./gulp:/opt/app/gulp
      - ./releases:/opt/app/releases

      - ./google-services.json:/opt/app/platforms/android/google-services.json
      - ./eff-alerts.keystore:/opt/app/eff-alerts.keystore
    ports:
      - '4001:4001'

Add ./config to docker compose volumes
Add ./config to docker compose volumes
