Merge pull request #307 from glennsarti/add-port

(maint) Add port 9000 for dev. container

Author: jpogran

.devcontainer/devcontainer.json

@@ -10,9 +10,9 @@
   // Add the IDs of extensions you want installed when the container is created.
   "extensions": [
     "rebornix.Ruby"
-  ]
+  ],
   // Use 'forwardPorts' to make a list of ports inside the container available locally.
-  // "forwardPorts": [],
+  "forwardPorts": [9000],
   // Use 'postCreateCommand' to run commands after the container is created.
   // "postCreateCommand": "ruby --version",
   // Uncomment to connect as a non-root user. See https://aka.ms/vscode-remote/containers/non-root.