Thanks so much for reaching out. In general the way that we at Gatling recommend integrating a CI/CD solution with Gatling is to use Gatling Enterprise (Cloud, Self-Hosted, or Marketplace options) which has an API and native integrations that allow you easily to connect with Jenkins and many others. If you like feel free to reach out to me at pdutka@gatling.io and I can set you up with a demo.
If you’re looking for an Open-Source solution maybe another community member can help you out.