Refer to the exhibit. A developer wants to automatically deploy infrastructure for a containerized application. A .gitlab-ci.yml file must describe a pipeline that builds a container based on a supplied Dockerfile and executes an Ansible playbook on the configured container. What must be added where the code S missing to complete the script? A) B) C) D)

To complete the CI/CD pipeline, the built Docker image must be uploaded to the GitLab Container Registry so that subsequent stages can access it. In the build_container stage, the script builds an image and runs a container, but these actions only occur locally on the GitLab Runner. The second stage, get_config, specifies image: registry.gitlab.com/$DOCKER_USERNAME/$DOCKER_REPOSITORY. For the runner to pull this image in the next stage, the image must first be pushed to the remote registry. The docker push command is the standard Docker CLI instruction used to share local images with a registry. Without this step, the second stage would fail to locate the updated image.

Option A is incorrect because docker assign is not a valid Docker CLI command. To associate a name with an image, docker tag or docker commit is used instead.

Option B is incorrect because docker info is a diagnostic command used to display system-wide information regarding the Docker installation. It does not perform image uploads.

Option C is incorrect because docker logout terminates the authenticated session with the registry. Executing this before pushing would prevent the image from being uploaded, causing the pipeline to fail.

GitLab Official Documentation: GitLab CI/CD - Use Docker to build images. This section details the requirement to push images to the registry using docker push so they can be used in later stages.

Docker Documentation: Docker CLI Reference - docker push. Describes the syntax and purpose of uploading images to a registry.

Cisco DevNet Associate (DEVASC) 200-901 Official Cert Guide: Chapter 16, "Application Deployment and Security," covers the workflow of building, pushing, and pulling images within a CI/CD pipeline.

GitLab Official Documentation: Container Registry - Authenticate with the Container Registry. Explains the lifecycle of login, build, push, and logout within .gitlab-ci.yml.