Add a database and test users for advanced testing

[nhoening]

No description provided.

[victorgarcia98]

Taking some bites from the FM core docker-compose.yaml, I suggest we add this file to the plugin template:

version: "3.4"

services:
  server:
    build:
      context: .
      dockerfile: Dockerfile
    ports:
      - 5000:5000
    depends_on:
      - test-db  # use -e SQLALCHEMY_TEST_DATABASE_URI=... to exec pytest
    restart: on-failure
    healthcheck:
      test: ["CMD", "curl", "-f", "http://localhost:5000/api/v3_0/health/ready"]
      start_period: 10s
      interval: 20s
      timeout: 10s
      retries: 6
    environment:
      SQLALCHEMY_DATABASE_URI: "postgresql://fm-test-db-user:fm-test-db-pass@test-db:5432/fm-test-db"
      SECRET_KEY: notsecret
      FLASK_ENV: development
      LOGGING_LEVEL: INFO 
      FLEXMEASURES_PLUGINS: /app/{{cookiecutter.plugin_name}}
    entrypoint: ["/bin/sh", "-c"]
    command:
    - |
      pip install -r instance/requirements.txt
      flexmeasures db upgrade
      flexmeasures add toy-account --name 'Docker Toy Account'
      gunicorn --bind 0.0.0.0:5000 --worker-tmp-dir /dev/shm --workers 1 --threads 4 wsgi:application
  test-db: #  sudo docker compose down --volumes
    image: postgres
    expose:
      - 5432
    restart: always
    environment:
      POSTGRES_DB: fm-test-db
      POSTGRES_USER: fm-test-db-user
      POSTGRES_PASSWORD: fm-test-db-pass
    volumes:
      - ./ci/load-psql-extensions.sql:/docker-entrypoint-initdb.d/load-psql-extensions.sql

For this to work, we would need to add the file load-psql-extensions.sql with the instructions to install the extensions.