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CI: revert to simple make without shell override #65

Job	Run time
Rocky Linux 9	24s
macOS (macos-latest)	10s
Ubuntu (24.04 LTS)	21s
macOS (macos-26)	10s
Debian (stable)	24s
Debian (oldstable)	33s
Alpine (latest)	11s
Arch Linux	17s
openSUSE Leap	56s
Fedora (latest)	21s
Ubuntu (latest)	33s
Tag and release on version change	5s
	4m 25s

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