Overall scenario:
Our project is managed in Jira, including testing with Xray (e.g. using Jira & Xray for single-source of truth of testing results) and our source code (including for automated tests) and CI/CD is managed in GitLab.

In this scenario, we want to trigger automation in GitLab from the Xray side and report the results back to Xray and Jira.

Check the written tutorial here: https://xr4y.io/xray-gitlab/
Start your free Xray trial at: https://www.getxray.app/