Troubleshooting for to short command line

[squonk11]

This is not an idea for a new feature but an idea to improve the documentation:
I run Homeassistant as a VirtualBox VM on a x86 system with Ubuntu 22.04LTS (headless). For registering my phone number using signal-cli-rest-api I also installed SSH access to the VM as described here. When trying to register the phone number using a captcha I had the problem, that the max. command line length was to short (probably max 1024); already the captcha code is longer than that. So, I stored the captcha code with two steps into an environment variable like this:
CAPTCHA=<CAPTCHA part1>
CAPTCHA="$CAPTCHA"<CAPTCHA part2>
Then I made the registration with a short command line like this:
curl -X POST -H "Content-Type: application/json" -d '{"pin":"1234", "captcha":"'"$CAPTCHA"'"}' 'http://127.0.0.1:8080/v1/register/<number>'
Maybe you can add this to the documentation as a further trouble shooting guide in case other people encounter the same issue.