fix: openEuler majorVersion

bin/build.sh

@@ -159,7 +159,8 @@ case $(get_os_info) in
     ;;
     openEuler)
         ptype=rpm
-        RelOS=oe20
+        majorVersion=${OSVersion:0:2}
+        RelOS=oe${majorVersion}
         RpmPkgName=${ProjectL}-${RelVer}.${RpmArch}.${ptype}
         RpmPkgRename=${ProjectL}-r${RelVer}-${RelOS}-${RelArch}.${ptype}
     ;;