Add global meta setting to amplify. #11782

Job	Run time
build_details	4s
build_opam (4.14.x)	8m 50s
build_js	2m 0s
build_opam (5.2.x)	5m 6s
tree_sitter_parse	50s
lezer_parse	50s
build_no_depopts	5m 50s
build_posix (debian_trixie, amd64)	15m 40s
build_posix (debian_bookworm, amd64)	15m 1s
build_win32 (x64)	17m 37s
build_posix (ubuntu_oracular, amd64)	14m 53s
run_tests (@citest)	12m 58s
build_posix (ubuntu_noble, amd64)	15m 48s
run_tests (@doctest)	8m 4s
update_doc	0s
build_posix (alpine, amd64)	13m 9s
run_tests (@mediatest)	12m 38s
fetch_s3_artifacts	20s
build_docker (amd64)	2m 27s
build_docker_minimal (amd64)	2m 21s
build_docker_alpine (amd64)	1m 6s
build_docker_alpine_minimal (amd64)	44s
update_release	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 36m 16s

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