update docker deploy config

.env.production.example

@@ -0,0 +1,12 @@
+# Database
+POSTGRES_USER=delivery_user
+POSTGRES_PASSWORD=your_secure_password_here
+POSTGRES_DB=delivery_tracker
+
+# JWT
+JWT_SECRET=your_random_jwt_secret_min_32_chars
+
+# Gitea Registry credentials for Watchtower
+GITEA_REGISTRY=gitea.your-domain.com/yourusername
+GITEA_USER=your_gitea_username
+GITEA_TOKEN=your_gitea_token_or_password