feat(devcontainer): add Docker outside of Docker feature

* Included the `docker-outside-of-docker` feature to enhance container capabilities.
* This allows for better integration and management of Docker within the development container.

Author: dgibbs64

.devcontainer/devcontainer.json

@@ -8,6 +8,7 @@
     "ghcr.io/devcontainers-extra/features/markdownlint-cli:1": {},
     "ghcr.io/devcontainers-extra/features/shellcheck:1": {},
     "ghcr.io/devcontainers-extra/features/yamllint:2": {},
+    "ghcr.io/devcontainers/features/docker-outside-of-docker:1": {},
     "ghcr.io/devcontainers/features/github-cli:1": {}
   },
   "customizations": {