fix: Update devcontainer.json for speed

Author: ohgodwhy2k

.devcontainer/devcontainer.json

@@ -2,26 +2,40 @@
 {
   "name": "QuickSite Node Template",
   "image": "mcr.microsoft.com/devcontainers/javascript-node:20",
+
+  // Use the same user defined in the base image (recommended)
+  "remoteUser": "node",
+
+  // Optional but very useful for CLI work
+  "features": {
+    "ghcr.io/devcontainers/features/git:1": {}
+  },
+
   "customizations": {
     "vscode": {
       "settings": {
-        "npm.packageManager": "npm"
-      }
+        "npm.packageManager": "npm",
+        "editor.formatOnSave": true
+      },
+      "extensions": [
+        "esbenp.prettier-vscode",
+        "dbaeumer.vscode-eslint",
+        "eamodio.gitlens"
+      ]
     }
   },
 
-  // 1. Install dependencies immediately after the container is built.
+  // Install dependencies *once* when container is created
   "postCreateCommand": "npm ci",
 
-  // 2. Run the build and start the server after the user attaches.
-  // We use 'npm start' because your package.json already defines it as:
-  // "start": "npm run build && node serve.js"
+  // Keep your auto-start behavior, but optional
   "postAttachCommand": "npm start",
 
-  // 3. Optional: Set VS Code to automatically forward the port 4920
+  // Automatically reinstall on source updates (faster than postCreateCommand rerun)
+  "updateContentCommand": "npm ci",
+
   "forwardPorts": [4920],
 
-  // 4. Optional: Instruct VS Code to open the browser automatically
   "portsAttributes": {
     "4920": {
       "label": "Dev Server",
@@ -31,5 +45,10 @@
       "revealAtStart": true,
       "closeAction": "notify"
     }
-  }
+  },
+
+  // Persist npm cache to speed up rebuilds
+  "mounts": [
+    "source=node_modules_cache,target=/tmp/npmcache,type=cache"
+  ]
 }