Don't worry about "reload" in k8s, just delete the pod and let another come up. Or if you bake it into the image like Daniel suggested, it'll be handled for you!
Otherwise, the helm chart also supports a string in your values file, or using a ConfigMap: https://github.com/apache/airflow/blob/2cd12fc86950646d10dfb5fb7f9c76c529715b46/chart/values.yaml#L997-L1006 It sounds like you found the right spot in the Airflow core docs, but for completeness/others benefit: https://airflow.apache.org/docs/apache-airflow/stable/administration-and-deployment/security/webserver.html#other-methods
