A skill for local testing. I don't know when I'll get a chance to get to this, but putting it on my list.

@BasPH @jonathanleek @TJaniF fyi

Should include

• knowledge about dag.test()
• knowledge about astro dev bash, astro dev pytest
• knowledge of structural DAG tests
• knowledge of separating out functions with @task for easier unit testing
• knowledge about local fake-driven testing, and local mock integration testing
  • testcontainers
  • docker compose override
  • creating connections / airflow_settings.yaml / astro env