Add explanation. #11857

Job	Run time
build_opam (4.14.x)	9m 26s
build_js	2m 27s
build_details	3s
build_opam (5.2.x)	5m 15s
build_win32 (x64)	14m 49s
lezer_parse	50s
build_no_depopts	5m 54s
build_posix (debian_trixie, amd64)	14m 48s
build_posix (debian_trixie, arm64)	12m 47s
tree_sitter_parse	49s
run_tests (@citest)	13m 11s
build_posix (debian_bookworm, amd64)	14m 20s
update_doc	10m 21s
build_posix (debian_bookworm, arm64)	12m 49s
build_posix (ubuntu_oracular, amd64)	14m 41s
run_tests (@doctest)	8m 15s
build_posix (ubuntu_oracular, arm64)	11m 57s
run_tests (@mediatest)	11m 48s
build_posix (ubuntu_noble, amd64)	14m 44s
build_posix (ubuntu_noble, arm64)	12m 19s
build_posix (alpine, amd64)	10m 6s
build_posix (alpine, arm64)	8m 20s
fetch_s3_artifacts	1s
build_docker_alpine	1s
build_docker	1s
build_docker_alpine_minimal	1s
build_docker_minimal	1s
build_docker_release	1s
build_docker_release-minimal	1s
update_release	1s
	3h 30m 7s

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