task: add more env var documentation #5766

Job	Run time
build_windows (3.13)	36m 18s
build_windows (3.11)	37m 44s
build_windows (3.9)	36m 51s
build_linux (3.13)	34m 19s
build_linux (3.12)	34m 19s
build_linux (3.9)	33m 44s
build_linux (3.10)	34m 14s
build_windows (3.10)	36m 53s
build_linux (3.11)	33m 37s
build_windows (3.12)	38m 7s
test_examples_linux (3.11, false, ubuntu-22.04)	7m 59s
test_linux (3.9, false, ubuntu-22.04)	10m 23s
test_linux (3.11, false, ubuntu-22.04)	10m 45s
test_linux (3.10, false, ubuntu-22.04)	10m 3s
array-api-conformity (3.10, false, ubuntu-22.04)	5m 10s
test_linux (3.13, false, ubuntu-22.04)	9m 46s
test_linux (3.12, false, ubuntu-22.04)	10m 18s
test_windows (3.11, false, windows-latest)	13m 7s
test_windows (3.9, false, windows-latest)	12m 55s
test_windows (3.13, false, windows-latest)	13m 19s
test_windows (3.12, false, windows-latest)	12m 51s
test_windows (3.10, false, windows-latest)	13m 11s
upload_linux	0s
upload_windows	-1s
Clean up anaconda packages	0s
	8h 5m 52s

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