Worked on stabilizing container image pulls in the gitlabhq/gitlab-runner repository by addressing a regression in HTTP registry authentication. Focused on updating the regular expression used for registry validation to recognize both HTTP and HTTPS protocols, this change ensured that legacy and private Docker registries using http:// were properly supported. The solution involved careful debugging and incremental updates to the authentication flow, reducing CI/CD pipeline failures related to registry authentication. Utilized Go for implementation, leveraging skills in Docker and regular expressions to enhance compatibility and reliability of the authentication process without introducing new features during the development period.