Fix newline stripping when passing the tmp file as path

This fixes the issue where the input data gets too large for the
commandline argument buffer

scripts/cloudron-support

@@ -141,8 +141,7 @@ if [[ "${enableSSH}" == "true" ]]; then
 fi
 
 echo -n "Uploading information..."
-# for some reason not using $(cat $OUT) will not contain newlines!?
-paste_key=$(curl -X POST ${PASTEBIN}/documents --silent -d "$(cat $OUT)" | python3 -c "import sys, json; print(json.load(sys.stdin)['key'])")
+paste_key=$(curl -X POST ${PASTEBIN}/documents --silent --data-binary "@$OUT" | python3 -c "import sys, json; print(json.load(sys.stdin)['key'])")
 echo "Done"
 
 echo ""