chore: Dockerized development examples (#15099)

docs/development/local-development.md

@@ -65,6 +65,21 @@ If you are using [VS Code](https://code.visualstudio.com/) you can skip installi
 
 The VS Code [integrated terminal](https://code.visualstudio.com/docs/editor/integrated-terminal) is now running in the container and can be used to run additional commands.
 
+#### Local Docker
+
+If, for some reason, you can't run the relevant versions on your local machine, you can run everything from a Docker image.
+To build the correct docker image:
+
+```
+docker build -f .devcontainer/Dockerfile -t renovatebot_local .
+```
+
+Then you can run Yarn directly from Docker, for instance:
+
+```
+docker run -it --rm -v "$PWD":/usr/src/app -w /usr/src/app renovatebot_local yarn install
+```
+
 ## Fork and Clone
 
 If you want to contribute to the project, you should first "fork" the main project using the GitHub website and then clone your fork locally.