Single: always return a fresh source. (#4200) #11743

Job	Run time
build_js	1m 58s
build_details	4s
build_opam (4.14.x)	8m 43s
build_opam (5.2.x)	5m 20s
lezer_parse	51s
build_no_depopts	5m 37s
build_win32 (x64)	17m 34s
build_posix (debian_trixie, amd64)	15m 20s
run_tests (@citest)	13m 11s
build_posix (debian_bookworm, amd64)	14m 42s
tree_sitter_parse	50s
run_tests (@doctest)	7m 40s
build_posix (ubuntu_oracular, amd64)	14m 33s
update_doc	11m 44s
build_posix (ubuntu_noble, amd64)	14m 24s
run_tests (@mediatest)	11m 59s
build_posix (alpine, amd64)	12m 4s
fetch_s3_artifacts	22s
build_docker (amd64)	2m 43s
build_docker_minimal (amd64)	2m 29s
build_docker_alpine (amd64)	55s
build_docker_alpine_minimal (amd64)	44s
update_release	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 43m 47s

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