add nodejs to devcontainer

Author: jordanstephens

.devcontainer/devcontainer.json

@@ -6,6 +6,9 @@
   "features": {
     "ghcr.io/defanglabs/devcontainer-feature/defang-cli:1.0.4": {},
     "ghcr.io/devcontainers/features/docker-in-docker:2": {},
+    "ghcr.io/devcontainers/features/node:1": {
+      "version": "20"
+    },
     "ghcr.io/devcontainers/features/go:1": {
       "version": "1.23"
     }