Alright, first things first, let's get you set up with a Supabase project. Head over to Supabase.io and sign up if you haven't already. Once you're in, click on "New Project" and fill in the details. It's pretty straightforward, just follow the prompts.

Now that your Supabase project is ready, let's hop over to your GitLab repository. Go to "Settings" and then "CI/CD". Click on "Variables". Here, you'll add the environment variables your project needs for deployment. Typically, you'll need your Supabase URL and Supabase Service Role Key. You can find these in the Project Settings in your Supabase account.

Next up, we need to create a .gitlab-ci.yml file. This file is crucial because GitLab CI uses it to manage your project's build. If you don't have this file yet, create it in the root of your project.

Inside this file, you'll define the stages of your CI/CD process. This could include stages like build, test, and deploy. Don't forget to specify the docker image you want to use.

Within the .gitlab-ci.yml file, you'll need to create a script to handle your application's deployment. The exact script will depend on your project's needs, but generally, it will involve building your project and deploying it to Supabase.

Once everything is set up, commit your changes and push them to your GitLab repository. When you push the changes, GitLab CI will pick up the .gitlab-ci.yml file and start the process described in the file. You can monitor the progress in the "CI/CD" section under "Pipelines" in your GitLab repository.

Finally, once the pipeline is done, check your Supabase project to make sure your application has been deployed correctly. If there are any errors, check the logs produced by the GitLab CI pipeline to debug and fix them. And there you have it, your automatic deployment setup with GitLab CI and Supabase is complete!