Set up devcontainer with Node 24 LTS and Ona automations (#7)

- Switch Dockerfile to javascript-node:24-bookworm
- Configure devcontainer with port forwarding for Astro dev server
- Add automations.yaml with install-deps task and dev-server service
- Fix allowedHosts placement in astro.config.mjs (move to Astro server config)

Co-authored-by: Ona <no-reply@ona.com>

Author: Siddhant-K-code

.devcontainer/Dockerfile

@@ -0,0 +1 @@
+FROM mcr.microsoft.com/devcontainers/javascript-node:24-bookworm

.devcontainer/devcontainer.json

@@ -0,0 +1,14 @@
+{
+	"name": "Agentic Engineering Guide",
+	"build": {
+		"context": ".",
+		"dockerfile": "Dockerfile"
+	},
+	"forwardPorts": [4321],
+	"portsAttributes": {
+		"4321": {
+			"label": "Astro Dev Server",
+			"onAutoForward": "notify"
+		}
+	}
+}

.ona/automations.yaml

@@ -0,0 +1,18 @@
+tasks:
+  install-deps:
+    name: Install dependencies
+    description: Install npm dependencies for the Astro project.
+    command: |
+      npm ci
+    triggeredBy:
+      - postDevcontainerStart
+
+services:
+  dev-server:
+    name: Dev Server
+    description: Astro dev server with live reload.
+    commands:
+      start: |
+        npm run dev -- --host 0.0.0.0 --port 4321
+      ready: |
+        curl -f http://localhost:4321

astro.config.mjs

@@ -7,11 +7,11 @@ export default defineConfig({
   site: "https://agents.siddhantkhare.com",
   base: "/",
   integrations: [mdx(), sitemap()],
+  server: {
+    allowedHosts: true,
+  },
   vite: {
     plugins: [tailwindcss()],
-    server: {
-      allowedHosts: true,
-    },
   },
   markdown: {
     shikiConfig: {