Add CS_IGNORE_UNFIXED to Container Scanning docs

doc/user/application_security/container_scanning/index.md

@@ -222,6 +222,7 @@ You can [configure](#customizing-the-container-scanning-settings) analyzers by u
 | `CS_DISABLE_DEPENDENCY_LIST`   | `"false"`      | Disable Dependency Scanning for packages installed in the scanned image. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/345434) in GitLab 14.6. | All |
 | `CS_DISABLE_LANGUAGE_VULNERABILITY_SCAN` | `"true"` | Disable scanning for language-specific packages installed in the scanned image. [Introduced](https://gitlab.com/gitlab-org/gitlab/-/issues/345434) in GitLab 14.6. | All |
 | `CS_DOCKER_INSECURE`           | `"false"`     | Allow access to secure Docker registries using HTTPS without validating the certificates. | All |
+| `CS_IGNORE_UNFIXED`            | `"false"`     | Ignore vulnerabilities that are not fixed. | All |
 | `CS_REGISTRY_INSECURE`         | `"false"`     | Allow access to insecure registries (HTTP only). Should only be set to `true` when testing the image locally. Works with all scanners, but the registry must listen on port `80/tcp` for Trivy to work. | All |
 | `CS_SEVERITY_THRESHOLD`        | `UNKNOWN`     | Severity level threshold. The scanner outputs vulnerabilities with severity level higher than or equal to this threshold. Supported levels are Unknown, Low, Medium, High, and Critical. | Trivy |
 | `DOCKER_IMAGE`                 | `$CI_APPLICATION_REPOSITORY:$CI_APPLICATION_TAG` | The Docker image to be scanned. If set, this variable overrides the `$CI_APPLICATION_REPOSITORY` and `$CI_APPLICATION_TAG` variables. | All |