Native CAPTCHA randomly fails to generate an image
It looks like the captcha library is buggy and sometimes returns an empty binary instead of an image.
On the front end side it looks so:
I suspect it's the same problem as reported in https://github.com/davidqhr/elixir-captcha/issues/3
The solution would be to use
System.cmd instead of
Port.open. What do you think @rinpatch?