Add a key4hep build workflow; previous commit: Update pre-commit lice… #604

Job	Run time
test (sft.cern.ch/lcg/views, dev3/latest/x86_64-centos7-gcc11-opt)	1m 40s
test (sw.hsf.org, key4hep)	4m 30s
test (sw-nightlies.hsf.org, key4hep)	6m 58s
	13m 8s

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