Keep default compression level for first artifact #1583

Job	Run time
build (ubuntu-24.04, clang-18)	4m 40s
build (ubuntu-24.04, gcc-14)	7m 20s
build-test-downstream (ubuntu-24.04, clang-18)	2m 10s
build (macos-13, clang-14)	4m 31s
build-test-downstream (ubuntu-24.04, gcc-14)	2m 56s
build (macos-14, armv8-clang-14)	2m 49s
build-test-downstream (macos-13, clang-14)	1m 40s
build-test-downstream (macos-14, armv8-clang-14)	1m 1s
build (windows-2022, msvc-1940)	4m 20s
build-test-downstream (windows-2022, msvc-1940)	3m 18s
test (ubuntu-24.04, clang-18)	3m 10s
test (ubuntu-24.04, gcc-14)	3m 23s
docker (ubuntu-24.04, clang-18)	19s
test (macos-13, clang-14)	3m 36s
test (macos-14, armv8-clang-14)	1m 52s
	47m 5s

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