CI-unixish

use `emplace_back` #1299

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Run time

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Job	Run time
build (ubuntu-22.04, g++)	41s
build (macos-15, clang++)	1m 5s
build (ubuntu-24.04, clang++)	3m 36s
build (ubuntu-22.04, clang++)	58s
build (macos-14, clang++)	36s
build (macos-26, clang++)	2m 23s
build (ubuntu-24.04, g++)	3m 2s
build (macos-15-intel, clang++)	1m 19s
	13m 40s