feat: auto-load staging secrets from .env and fix DS_PASSWORD plumbing #1548

Job	Run time
Collect changes / collect-changes	10s
Python tests / types-check	18s
Python tests / unit-tests (py310)	1m 7s
Python tests / docs-scripts-tests	18s
Python tests / lint-and-format-check	9s
Python tests / unit-tests (py314)	1m 6s
Python tests / unit-tests (py312)	1m 6s
Python tests / unit-tests (py313)	1m 6s
Python tests / unit-tests (py311)	1m 6s
status-check	3s
	6m 29s

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