CI: Change default containter to oraclelinux:10 #304

Job	Run time
check / editor-config	5s
check / clang-checks	1m 18s
build-os-matrix	2s
rpm-build (oraclelinux:10) / rpm-build	5m 47s
make-tests (oraclelinux:10) / tests	1m 25s
build (oraclelinux:10) / build	1m 41s
ipfix-elements-check / ipfix-elements-checks	16s
rpm-install (oraclelinux:10) / rpm-install	55s
	11m 29s

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