Конвейер Azure не подключается к службе базы данных при выполнении тестов

Я пытаюсь запустить тесты приложения Django на azure с помощью Azure pipelines. Но каждый раз, когда я пытаюсь подключиться к базе данных, я сталкиваюсь с ошибкой.

Файл .yml, используемый для конвейера, выглядит следующим образом:

resources:
  containers:
  - container: pg12
    image: postgres:12
    env:
      POSTGRES_USER: beta
      POSTGRES_PASSWORD: beta
      POSTGRES_DB: beta
    ports:
        - 5432
    # needed because the postgres container does not provide a healthcheck
    options: --health-cmd pg_isready --health-interval 10s --health-timeout 5s --health-retries 5

variables:
- name: DJANGO_SETTINGS_MODULE
  value: config.settings.production
- name: DJANGO_SECRET_KEY
  value: <redacted>
- name: DEBUG
  value: False
- name: DATABASE_URL
  value: postgres://beta:beta@localhost:5432/beta

trigger:
- qa

pool:
  vmImage: ubuntu-latest
strategy:
  matrix:
    Python37:
      PYTHON_VERSION: '3.7'
  maxParallel: 3

services:
  postgres: postgres:12

steps:
- script: printenv 
- task: UsePythonVersion@0
  inputs:
    versionSpec: '$(PYTHON_VERSION)'
    architecture: 'x64'

- script: |
    sudo apt install -y postgresql-client
    # sudo psql --host=postgres --username=postgres --command="SELECT 1;"

- task: PythonScript@0
  displayName: 'Export project path'
  inputs:
    scriptSource: 'inline'
    script: |
      """Search all subdirectories for `manage.py`."""
      from glob import iglob
      from os import path
      # Python >= 3.5
      manage_py = next(iglob(path.join('**', 'manage.py'), recursive=True), None)
      if not manage_py:
          raise SystemExit('Could not find a Django project')
      project_location = path.dirname(path.abspath(manage_py))
      print('Found Django project in', project_location)
      print('##vso[task.setvariable variable=projectRoot]{}'.format(project_location))

- script: |
    python -m pip install --upgrade pip setuptools wheel
    pip install -r requirements.txt
    pip install -r requirements/local.txt
    sudo apt-get install python-dev libpq-dev
  displayName: 'Install prerequisites'

- script: |
    pushd '$(projectRoot)'
    pytest
  displayName: 'Run tests'

- task: PublishTestResults@2
  inputs:
    testResultsFiles: "**/TEST-*.xml"
    testRunTitle: 'Python $(PYTHON_VERSION)'
  condition: succeededOrFailed()```

Can you tell me what is the source of the error and how can I fix it?

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