The GitHub Actions job "Build Images" on airflow.git has failed.
Run started by GitHub user ryantam626 (triggered by ryantam626).

Head commit for run:
a4384ed7d68d943464bc5a5d1c498909ef1a8562 / Ryan Tam <[email protected]>
Wait for xcom sidecar container to start before sidecar exec

According to k8s's docs on pod phase [1], "Running" state means "The Pod has 
been bound to a node,
and all of the containers have been created. At least one container is still 
running,
or is in the process of starting or restarting.".

There is no guarantee that the xcom sidecar container will have been
running by the time the `extract_com` is used by KPO's `execute` -
meaning if the base container has completed before the xcom sidecar
container is running, the entire operator fails because you cannot exec
against a non-running container.

Fix is to wait for the xcom sidecar container to be in the running state
before we exec against it, which this commit implements.

[1] - 
https://kubernetes.io/docs/concepts/workloads/pods/pod-lifecycle/#pod-phase
[2] - 
https://github.com/schattian/airflow/blob/86171ff43f8977021708cfa241da64f96c4c15e2/airflow/providers/cncf/kubernetes/operators/kubernetes_pod.py#L398

Report URL: https://github.com/apache/airflow/actions/runs/2669870583

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