Docker/Linux issue

Hi, im using webhookrelay.com agent to forward webhooks from server 1 to server 2, Its working correctly other than I get a error on server 1= x509: certificate signed by unknown authority when making a post request to my destination server 2. I believe this is something to do with docker, and I need to allow my linux server 1 /docker to ignore this message, or install the certificate /certificate authority which exists on server 2 on server 1. But i dont know how to do this. Someone who is good at linux management / docker can achieve I think