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Where to specify credentials of the repository to GitLab ci/cd pipeline?

I have installed the latest version of SonarQube in my system and successfully integrate the SonarQube with GitLab.

When I run GitLab CI/CD pipeline it shows an error as Could not resolve dependencies for project and Authentication failed for https://example.com:7790/develop/application_name:401 Unauthorized.

My question is how to remove the above error?
Where to specify authentication credentials?
Where to specify credentials of any repository?