test_k8s: introduce a DAG that runs an idempotent HDFS command via Skein
This will allow us to ensure that we can run a Skein job in Kubernetes,
either via the LocalExecutor
or the KubernetesExecutor
, and that
user impersonation works as expected.
Signed-off-by: Balthazar Rouberol brouberol@wikimedia.org Bug: T377602