[CI-SKIP] Add script to commit upstream changelogs

Paper team can do paper upcommit when manual upstream updates are needed
this will generate a changelog of everything that has changed between then and now.

paper

@@ -82,6 +82,12 @@ case "$1" in
         scripts/upstreamMerge.sh "$basedir" "$2"
     )
     ;;
+    "cu" | "commitup" | "commitupstream" | "upcommit" | "upstreamcommit")
+    (
+        cd "$basedir"
+        scripts/upstreamCommit.sh "$@"
+    )
+    ;;
     "r" | "root")
         cd "$basedir"
     ;;
@@ -198,4 +204,4 @@ if [ "$failed" == "1" ]; then
 else
 	unset failed
 	true
-fi
+fi