Add global meta setting to amplify. #11781

Job	Run time
build_js	2m 12s
build_details	3s
build_opam (4.14.x)	8m 53s
build_opam (5.2.x)	5m 38s
tree_sitter_parse	50s
lezer_parse	50s
build_no_depopts	6m 35s
build_posix (debian_trixie, amd64)	15m 18s
build_win32 (x64)	17m 53s
build_posix (debian_bookworm, amd64)	14m 21s
run_tests (@citest)	12m 54s
build_posix (ubuntu_oracular, amd64)	15m 3s
run_tests (@doctest)	8m 57s
build_posix (ubuntu_noble, amd64)	15m 11s
run_tests (@mediatest)	12m 24s
update_doc	0s
build_posix (alpine, amd64)	12m 9s
fetch_s3_artifacts	23s
build_docker (amd64)	2m 13s
build_docker_minimal	0s
build_docker_alpine	0s
update_release	0s
build_docker_alpine_minimal	0s
build_docker_release-minimal	0s
build_docker_release	0s
	2h 31m 47s

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