Fix the media missing issue when boot UOS server ISO file.

IMG/cpio/ventoy/ventoy_chain.sh

@@ -377,6 +377,14 @@ ventoy_get_os_type() {
         echo 'chimera'; return
     fi
 
+    
+    if $GREP -q '4.19.' /proc/version; then
+        if [ -d /lib/dracut/hooks ]; then
+            echo 'openEuler'; return
+        fi
+    fi
+    
+    
     echo "default"
 }