chore: create devcontainer.json (#9563)

let's configure the devcontainer feature so that contributors can start
a dev environment directly from GitHub.

.devcontainer/devcontainer.json

@@ -0,0 +1,10 @@
+{
+  "image": "mcr.microsoft.com/devcontainers/universal:2",
+  "features": {
+    "ghcr.io/devcontainers/features/node:1": {},
+    "ghcr.io/devcontainers/features/docker-in-docker:1": {
+      "version": "latest",
+      "moby": true
+    }
+  }
+}