Add file listing environment variables to documentation #3716

Job	Run time
integration (v1.29.8, v0.56.8)	27m 38s
test-docker-build (base)	32s
integration (v1.29.8, v0.65.1)	27m 5s
test-docker-build (git)	1m 1s
integration (v1.31.0, v0.56.8)	27m 41s
test-docker-build (image-processing)	43s
integration (v1.31.0, v0.65.1)	27m 40s
test-docker-build (waiter)	32s
unit	3m 27s
e2e (v1.29.8, v0.56.8)	35m 3s
e2e (v1.29.8, v0.65.1)	36m 54s
e2e (v1.31.0, v0.56.8)	36m 16s
e2e (v1.31.0, v0.65.1)	35m 20s
	4h 19m 52s

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