CI: add PR workflow to check IPFIX element consistency with libfds #218

Job	Run time
check / clang-checks	1m 38s
check / editor-config	7s
build-os-matrix	3s
rpm-build (oraclelinux:9) / rpm-build	5m 55s
make-tests (oraclelinux:9) / tests	1m 44s
build (oraclelinux:9) / build	1m 59s
rpm-install (oraclelinux:9) / rpm-install	1m 20s
	12m 46s

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