Trigger a GitlabCI pipeline after it detects a change via a curl callback
One could set up a webhook between github and gitlab, see settings>integrations>github in gitlab or trigger a pipeline in gitlab by configuring github.

https://docs.gitlab.com/ee/ci/ci_cd_for_external_repos/github_integration.html

If one does not have a github account and one cannot fork the github project, one could create a script that runs on daily basis and triggers the gitlab pipeline by calling the pipeline API if "new release in github" is applicable.