Merge branch 'add-rhel8-build-ci' into 'develop'

Add rhel8 build ci

See merge request oai/cn5g/oai-cn5g-amf!16

build/scripts/build_helper

@@ -39,7 +39,7 @@ case "$OS_DISTRO" in
   ubuntu) OS_BASEDISTRO="debian"; INSTALLER="apt-get"; CMAKE="cmake" ;;
 esac
 
-IS_CONTAINER=`egrep -c "docker|kubepods|podman|runc-buildah|libpod" /proc/self/cgroup`
+IS_CONTAINER=`egrep -c "docker|kubepods|podman|buildah|libpod" /proc/self/cgroup || true`
 
 if [ $IS_CONTAINER -eq 0 ]
 then