How to link Env Groups with Cron. (Blueprint)

2

Problem solved.
It seems I needed to use the same region as the web service.
I also found the same Issue.

databases:
  - name: "Slack Bot DB"
    databaseName: slack_bot_db
    user: slack_bot_user
    region: singapore

services:
  - type: web
    region: singapore
    name: "Slack Bot Service"
    env: python
    buildCommand: "./scripts/build.sh"
    startCommand: "gunicorn config.wsgi:application"
    envVars:
      - key: DATABASE_URL
        fromDatabase:
          name: "Slack Bot DB"
          property: connectionString
      - key: SECRET_KEY
        generateValue: true
      - key: WEB_CONCURRENCY
        value: 4
  - type: cron
    region: singapore # <- required
    name: post_questions_command
    env: python
    schedule: "0 1 * * *"
    buildCommand: "poetry install"
    startCommand: "poetry run python manage.py post_questions_command"

But it looks like Env Groups needs to be configured manually.
It would be useful to be able to configure it in yaml.