If you are building a pipeline or tools to run on FireCloud, you may benefit from existing Docker images. For example, when you write the WDL for your tool, it could be easier to reference a Docker image that already contains Matlab or other dependencies.
You may have found the Broad Institute's public Docker Hub repository: broadinstitute. This repository includes a Docker image for the Firecloud-CLI that enables you to upload tools to FireCloud. However, this repo is not particularly helpful if you are building tools.
Eventually, FireCloud may support a Docker Hub repository with best practice images for tool developers. In the meantime, you can check out the Broad GDAC repository: broadgdac. Here you can find Docker images for R, Matlab, Nozzle, and other GDAC tools (e.g., GISTIC2.0) that could integrate with your pipeline.
For more information on Docker, refer to Tool Developer Basics and Best practices for Docker images and Dockerfiles.