fixup: use space-delimited string instead (due to gha limitations) #160

Job	Run time
prepare-matrices	1s
build-windows	11m 36s
build-macos	2m 54s
prepare-linux	3s
build-linux	6m 19s
macOS end-to-end tests (macos12)	1m 12s
macOS end-to-end tests (macos13)	1m 6s
macOS end-to-end tests (macos14)	1m 6s
Linux end-to-end tests (debian11)	16m 37s
Linux end-to-end tests (debian12)	17m 51s
Linux end-to-end tests (ubuntu2004)	18m 26s
Linux end-to-end tests (ubuntu2204)	17m 10s
Linux end-to-end tests (ubuntu2304)	20m 16s
Linux end-to-end tests (fedora38)	19m 30s
Linux end-to-end tests (fedora37)	17m 5s
Linux end-to-end tests (fedora36)	18m 23s
Windows end-to-end tests (windows10)	21m 21s
Windows end-to-end tests (windows11)	19m 19s
Result matrix	2m 19s
	3h 32m 34s

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