task: add more env var documentation #5764

Job	Run time
build_linux (3.11)	33m 24s
build_linux (3.10)	33m 49s
build_linux (3.12)	33m 54s
build_linux (3.13)	34m 15s
build_windows (3.10)	37m 13s
build_windows (3.13)	36m 57s
build_windows (3.11)	38m 28s
build_windows (3.12)	38m 41s
build_windows (3.9)	36m 33s
build_linux (3.9)	34m 32s
test_examples_linux (3.11, false, ubuntu-22.04)	7m 15s
test_linux (3.10, false, ubuntu-22.04)	18m 36s
array-api-conformity (3.10, false, ubuntu-22.04)	6m 10s
test_linux (3.12, false, ubuntu-22.04)	12m 21s
test_linux (3.9, false, ubuntu-22.04)	12m 12s
test_linux (3.11, false, ubuntu-22.04)	10m 21s
test_linux (3.13, false, ubuntu-22.04)	11m 24s
test_windows (3.11, false, windows-latest)	13m 3s
test_windows (3.13, false, windows-latest)	12m 30s
test_windows (3.12, false, windows-latest)	12m 53s
test_windows (3.10, false, windows-latest)	14m 13s
test_windows (3.9, false, windows-latest)	13m 51s
upload_windows	0s
upload_linux	0s
Clean up anaconda packages	0s
	8h 22m 35s

Provide feedback