CI: add PR workflow to check IPFIX element consistency with libfds #220

Job	Run time
check / editor-config	6s
check / clang-checks	1m 42s
build-os-matrix	4s
build (oraclelinux:9) / build	2m 7s
make-tests (oraclelinux:9) / tests	1m 48s
rpm-build (oraclelinux:9) / rpm-build	5m 34s
rpm-install (oraclelinux:9) / rpm-install	1m 12s
	12m 33s

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