CI: add PR workflow to check IPFIX element consistency with libfds #221

Job	Run time
check / editor-config	8s
check / clang-checks	1m 42s
build-os-matrix	2s
make-tests (oraclelinux:9) / tests	1m 43s
build (oraclelinux:9) / build	2m 0s
rpm-build (oraclelinux:9) / rpm-build	5m 44s
rpm-install (oraclelinux:9) / rpm-install	1m 13s
	12m 32s

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