CI: Add OpenBSD build tests for staged commits #251

Job	Run time
functionality-tests	18m 46s
source-maintenance-tests	2m 58s
CodeQL-tests	23m 34s
build-tests(ubuntu-22.04,gcc,default)	6m 7s
build-tests(ubuntu-22.04,gcc,minimal)	4m 24s
build-tests(ubuntu-22.04,gcc,maximus)	6m 22s
build-tests(ubuntu-22.04,clang,default)	6m 26s
build-tests(ubuntu-22.04,clang,minimal)	4m 58s
build-tests(ubuntu-22.04,clang,maximus)	6m 56s
	1h 20m 31s

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