Add file listing environment variables to documentation #3708

Job	Run time
unit	3m 6s
integration (v1.29.8, v0.56.8)	29m 1s
integration (v1.29.8, v0.65.1)	28m 39s
integration (v1.31.0, v0.56.8)	28m 34s
integration (v1.31.0, v0.65.1)	28m 37s
e2e (v1.29.8, v0.56.8)	36m 37s
test-docker-build (base)	34s
e2e (v1.29.8, v0.65.1)	35m 59s
test-docker-build (git)	1m 3s
e2e (v1.31.0, v0.56.8)	36m 7s
test-docker-build (image-processing)	46s
test-docker-build (waiter)	33s
e2e (v1.31.0, v0.65.1)	36m 15s
	4h 25m 51s

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