'Cypress - What is the baseURL used for running E2E tests on gitlab ci pipeline?

I have written my first E2E tests with Cypress, and so far I am using this cypress.json file:

{
    "baseUrl": "http://localhost/",
    "video": false
}

Now, I want to run my E2E tests on Gitlab CI pipeline. What baseURL I use? Any help?

gitlab cypress gitlab-ci

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