docs: added documentation on environment variables #32885

Job	Run time
setup	2m 3s
integration-tests-packages	12m 54s
Shard (0) HTTP Integration Tests	12m 19s
Shard (1) HTTP Integration Tests	8m 42s
Shard (0) Module Integration Tests	10m 44s
Shard (0) Unit Tests	8m 57s
Shard (1) Module Integration Tests	9m 42s
Shard (1) Unit Tests	5m 23s
unit-tests	1s
integration-tests-modules	1s
integration-tests-http	1s
	1h 10m 47s

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