GitLab CI/CD and GitHub Actions both allow you to create workflows that automatically build, test, publish, release, and deploy code.

GitHub Actions and GitLab CI/CD share several configuration similarities, which makes migrating to GitHub Actions relatively straightforward.

GitLab CI/CD and GitHub Actions both allow you to create workflows that automatically build, test, publish, release, and deploy code. GitLab CI/CD and GitHub Actions share some similarities in workflow configuration:

Workflow configuration files are written in YAML and are stored in the code's repository.
Workflows include one or more jobs.
Jobs include one or more steps or individual commands.
Jobs can run on either managed or self-hosted machines.
There are a few differences, and this guide will show you the important differences so that you can migrate your workflow to GitHub Actions.

More details:
https://docs.github.com/en/actions/migrating-to-github-actions/manually-migrating-to-github-actions/migrating-from-gitlab-cicd-to-github-actions