First log in to GitLab’s Container Registry using your GitLab username and password. If you have 2FA enabled you need to use a personal access token:

docker login registry-git.herzen.spb.ru

You can also use a deploy token for read-only access to the registry images.

Once you log in, you’re free to create and upload a container image using the common build and push commands

docker build -t registry-git.herzen.spb.ru/201693/cbs_practice_7_sem .
docker push registry-git.herzen.spb.ru/201693/cbs_practice_7_sem

Use different image names

GitLab supports up to 3 levels of image names. The following examples of images are valid for your project:

registry-git.herzen.spb.ru/201693/cbs_practice_7_sem:tag
registry-git.herzen.spb.ru/201693/cbs_practice_7_sem/optional-image-name:tag
registry-git.herzen.spb.ru/201693/cbs_practice_7_sem/optional-name/optional-image-name:tag