add gh auth config for decap

src/pages/api/auth.ts

@@ -0,0 +1,20 @@
+import type { APIRoute } from 'astro';
+import { env } from 'cloudflare:workers';
+
+export const prerender = false;
+
+export const GET: APIRoute = async ({ request }) => {
+  const clientId = (env as any).GITHUB_CLIENT_ID;
+
+  try {
+    const url = new URL(request.url);
+    const redirectUrl = new URL('https://github.com/login/oauth/authorize');
+    redirectUrl.searchParams.set('client_id', clientId);
+    redirectUrl.searchParams.set('redirect_uri', url.origin + '/api/callback');
+    redirectUrl.searchParams.set('scope', 'repo user');
+    redirectUrl.searchParams.set('state', crypto.getRandomValues(new Uint8Array(12)).join(''));
+    return Response.redirect(redirectUrl.href, 302);
+  } catch (error: any) {
+    return new Response(error.message, { status: 500 });
+  }
+};