CI: add PR workflow to check IPFIX element consistency with libfds #219

Job	Run time
check / clang-checks	1m 37s
check / editor-config	9s
build-os-matrix	3s
rpm-build (oraclelinux:9) / rpm-build	5m 46s
build (oraclelinux:9) / build	2m 4s
make-tests (oraclelinux:9) / tests	1m 43s
rpm-install (oraclelinux:9) / rpm-install	1m 13s
	12m 35s

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