How to provision dynamic review environments using merge requests and Argo CD

The introduction of a Pull Request generator for GitLab within the Argo CD project's ApplicationSet enables the dynamic provisioning of review environments directly from merge requests, streamlining the code review process through a GitOps workflow. This enhancement allows code reviewers and designers to efficiently evaluate changes in Kubernetes clusters from within the merge request, eliminating the delays traditionally associated with coordinating multiple team environments and addressing issues post-deployment. The ApplicationSet offers flexibility by enabling unprivileged users to deploy applications, deploying to multiple clusters simultaneously, and managing applications from a single monorepo. The GitLab Pull Request Generator uses the GitLab API to automatically detect new merge requests and create review environments based on specific filters, such as labels and merge request states, using templating options like merge request ID and branch name. This setup involves configuring necessary tools, setting up GitLab and Kubernetes environments, and creating secrets and ApplicationSets in Argo CD. Once configured, new applications based on merge requests can be provisioned and accessed directly, with the environment being automatically cleaned up upon closing the merge request, thus enhancing efficiency and collaboration in GitLab and Argo CD workflows.

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