add in ruby.

Author: RossBugginsNHS

src/devcontainers/base/src/.devcontainer/devcontainer.json

@@ -87,9 +87,9 @@
             "nvmVersion": "latest",
             "version": "lts"
         },
-        // "ghcr.io/devcontainers/features/ruby:1": {
-        //     "version": "latest"
-        // },
+        "ghcr.io/devcontainers/features/ruby:1": {
+             "version": "latest"
+         },
         "ghcr.io/devcontainers/features/go:1": {
             "version": "latest"
         },