Fix pod_template imagePullPolicy

[mabrikan]

Fix imagePullPolicy in provided pod_template.yaml

Use .Values.images.pod_template.pullPolicy

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[jedcunningham]

Yes, we should. @mabrikan, can you expand this test to cover the pull policy also? Thanks!

https://github.com/apache/airflow/blob/52560b87c991c9739791ca8419219b0d86debacd/tests/charts/test_pod_template_file.py#L281-L290

[mabrikan]

Done :heavy_check_mark: FYA @jedcunningham @potiuk @dstandish

[boring-cyborg[bot]]

Awesome work, congrats on your first merged pull request!