Add Docker setup with Caddy network integration

docker-compose.yml

@@ -2,7 +2,11 @@ services:
   cookbook:
     build: .
     restart: unless-stopped
-    ports:
-      - "3000:3000"
     volumes:
       - ./recipes:/app/recipes
+    networks:
+      - caddy
+
+networks:
+  caddy:
+    external: true