CI-unixish

CI-unixish.yml: added callgrind runs with `-O3` and LTO #1213

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Run time

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Job	Run time
build (macos-13, clang++)	1m 57s
build (ubuntu-22.04, clang++)	57s
build (macos-14, clang++)	39s
build (ubuntu-24.04, clang++)	3m 2s
build (ubuntu-22.04, g++)	37s
build (ubuntu-24.04, g++)	3m 1s
build (macos-15, clang++)	45s
	10m 58s