feat: add github oauth configuration

apps/blog/astro.config.mjs

@@ -1,5 +1,6 @@
 import { defineConfig } from 'astro/config';
 import vercel from '@astrojs/vercel';
+import auth from 'auth-astro';
 import remarkDirective from 'remark-directive';
 import remarkGfm from 'remark-gfm';
 import remarkSlug from 'remark-slug';
@@ -9,6 +10,7 @@ import remarkAside from './src/plugins/remark-aside.ts';
 export default defineConfig({
   output: 'static',
   adapter: vercel(),
+  integrations: [auth()],
   markdown: {
     remarkPlugins: [
       remarkGfm,