add direnv and terraform vscode extension

Author: phildier

.devcontainer/devcontainer.json

@@ -1,9 +1,18 @@
 {
   "image": "mcr.microsoft.com/devcontainers/universal:2",
   "features": {
+    "ghcr.io/christophermacgown/devcontainer-features/direnv:1": {},
     "ghcr.io/mickeahlinder/devcontainer-features/tfenv:1": {},
     "ghcr.io/devcontainers/features/python:1": {
-        "version": "3.11"
+      "version": "3.11"
+    }
+  },
+  "customizations": {
+    "vscode": {
+      "settings": {},
+      "extensions": [
+        "hashicorp.terraform"
+      ]
     }
   }
 }