| `CI_PROJECT_PATH_SLUG` | 9.3 | all | `$CI_PROJECT_PATH` lowercased and with everything except `0-9` and `a-z` replaced with `-`. Use in URLs and domain names. |
| `CI_PROJECT_URL` | 8.10 | 0.5 | The HTTP(S) address to access project |
| `CI_PROJECT_VISIBILITY` | 10.3 | all | The project visibility (internal, private, public) |
| `CI_REF_PROTECTED` | 11.10 | all | If the job is running on a protected branch |
| `CI_REGISTRY` | 8.10 | 0.5 | If the Container Registry is enabled it returns the address of GitLab's Container Registry |
| `CI_REGISTRY_IMAGE` | 8.10 | 0.5 | If the Container Registry is enabled for the project it returns the address of the registry tied to the specific project |
| `CI_REGISTRY_PASSWORD` | 9.0 | all | The password to use to push containers to the GitLab Container Registry |
