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Airflow 3 heavily relies on python in $PATH and can't start a k8s executor without it
Test plan:
$ docker buildx build -f docker/blubber.yaml --load --target ^Cild-prod-image -t docker-registry.wikimedia.org/repos/data-engineering/airflow-dags:v3.3.0 .
$ docker run -it docker-registry.wikimedia.org/repos/data-engineering/airflow-dags:v3.3.0 python
Python 3.11.2 (main, May 12 2026, 05:17:27) [GCC 12.2.0] on linuxCloses T433388