Document usage of DS_DISABLE_DIND

doc/user/application_security/dependency_scanning/index.md

@@ -37,7 +37,7 @@ The results are sorted by the severity of the vulnerability:
 
 ## Requirements
 
-To run a Dependency Scanning job, you need GitLab Runner with the
+To run a Dependency Scanning job, by default, you need GitLab Runner with the
 [`docker`](https://docs.gitlab.com/runner/executors/docker.html#use-docker-in-docker-with-privileged-mode) or
 [`kubernetes`](https://docs.gitlab.com/runner/install/kubernetes.html#running-privileged-containers-for-the-runners)
 executor running in privileged mode. If you're using the shared Runners on GitLab.com,
@@ -47,6 +47,8 @@ CAUTION: **Caution:**
 If you use your own Runners, make sure that the Docker version you have installed
 is **not** `19.03.00`. See [troubleshooting information](#error-response-from-daemon-error-processing-tar-file-docker-tar-relocation-error) for details.
 
+Privileged mode is not necessary if you've [disabled Docker in Docker for Dependency Scanning](#disabling-docker-in-docker-for-dependency-scanning)
+
 ## Supported languages and package managers
 
 The following languages and dependency managers are supported.
@@ -133,6 +135,7 @@ using environment variables.
 | `DS_PYTHON_VERSION`                     | Version of Python. If set to 2, dependencies are installed using Python 2.7 instead of Python 3.6. ([Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12296) in GitLab 12.1)| |
 | `DS_PIP_DEPENDENCY_PATH`                | Path to load Python pip dependencies from. ([Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12412) in GitLab 12.2) | |
 | `DS_DEFAULT_ANALYZERS`                  | Override the names of the official default images. Read more about [customizing analyzers](analyzers.md). | |
+| `DS_DISABLE_DIND`                       | Disable Docker in Docker and run analyzers [individually](#disabling-docker-in-docker-for-dependency-scanning).| |
 | `DS_PULL_ANALYZER_IMAGES`               | Pull the images from the Docker registry (set to `0` to disable). | |
 | `DS_EXCLUDED_PATHS`                     | Exclude vulnerabilities from output based on the paths. A comma-separated list of patterns. Patterns can be globs, file or folder paths. Parent directories will also match patterns. | `DS_EXCLUDED_PATHS=doc,spec` |
 | `DS_DOCKER_CLIENT_NEGOTIATION_TIMEOUT`  | Time limit for Docker client negotiation. Timeouts are parsed using Go's [`ParseDuration`](https://golang.org/pkg/time/#ParseDuration). Valid time units are `ns`, `us` (or `µs`), `ms`, `s`, `m`, `h`. For example, `300ms`, `1.5h`, or `2h45m`. | |
@@ -168,6 +171,23 @@ so that you don't have to expose your private data in `.gitlab-ci.yml` (e.g., ad
 </settings>
 ```
 
+### Disabling Docker in Docker for Dependency Scanning
+
+> [Introduced](https://gitlab.com/gitlab-org/gitlab/issues/12487) in GitLab Ultimate 12.5.
+
+You can avoid the need for Docker in Docker by running the individual analyzers.
+This does not require running the executor in privileged mode. For example:
+
+```yaml
+include:
+  template: Dependency-Scanning.gitlab-ci.yml
+
+variables:
+  DS_DISABLE_DIND: "true"
+```
+
+This will create individual `<analyzer-name>-dependency_scanning` jobs for each analyzer that runs in your CI/CD pipeline.
+
 ## Interacting with the vulnerabilities
 
 Once a vulnerability is found, you can interact with it. Read more on how to