Deploy Airflow with DAG example out of box

[maseiler]

When we us Helm to install Airflow, our own example should ship with it directly. Let everything handle automatically (no manual copying of DAG to container)

e.g.
https://airflow.apache.org/docs/helm-chart/stable/quick-start.html
https://cloud.google.com/composer/docs/run-apache-airflow-dag

[maseiler]

For now we can use the default examples. Unfortunately the runtime of these are very short and it would be better if we could monitor a job of at least a minute. Therefore we need a solution that allows us to add our own example easily.

[JulianLegler]

I added the default default-airflow-values.yaml file to our repo because there is already an example on how the git sync for DAGs could look like. If we decide to use this in the future.

[escapingpanda]

if we want the airflow to recognize our DAGs, we can 'kubectl cp' them to the airflow-scheduler pod in the "/opt/airflow/dags/" directory. Or we can create a storage for this purpose and assign it as the default DAG directory for airflow.

[maseiler]

FYI: I had to build a custom image of Airflow to include eBPF. Copying DAGs works like charm, but we have to use Docker Hub nonetheless.