CI: Add OpenBSD build tests for staged commits (#1964) #257

Job	Run time
CodeQL-tests	23m 55s
functionality-tests	18m 23s
source-maintenance-tests	2m 52s
build-tests(ubuntu-22.04,gcc,default)	5m 25s
build-tests(ubuntu-22.04,gcc,minimal)	4m 29s
build-tests(ubuntu-22.04,gcc,maximus)	6m 0s
build-tests(ubuntu-22.04,clang,default)	6m 37s
build-tests(ubuntu-22.04,clang,minimal)	4m 57s
build-tests(ubuntu-22.04,clang,maximus)	6m 56s
	1h 19m 34s

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