chore: support render deploy (#7)

README.md

@@ -14,11 +14,13 @@ The tunnel is based on `WebSocket`. We have a `WebSocket` connection between the
 
 Firstly please deploy this project to your own web host with public internet access. The project is just a `Node.js` web server based on `Express.js`. So just deploy as what you do for [deploying Node.js web server](https://developer.mozilla.org/en-US/docs/Learn/Server-side/Express_Nodejs/deployment).
 
-You can deploy with Heroku with `Deploy To Heroku` button below:
+#### Deploy to Heroku with following button
 
 [![Deploy To Heroku](https://www.herokucdn.com/deploy/button.svg)](https://heroku.com/deploy)
 
-With Heroku, you can get a free HTTPS web server with a fixed public domain.
+#### Deploy to Render with following button
+
+[![Deploy to Render](https://render.com/images/deploy-to-render-button.svg)](https://render.com/deploy)
 
 #### Get JWT Token
 

render.yaml

@@ -0,0 +1,17 @@
+services:
+  - type: web
+    name: lite_http_tunnel
+    env: node
+    buildCommand: npm install
+    startCommand: npm start
+    envVars:
+      - key: NODE_ENV
+        value: production
+      - key: SECRET_KEY
+        generateValue: true
+      - key: VERIFY_TOKEN
+        generateValue: true
+      - key: JWT_GENERATOR_USERNAME
+        sync: false
+      - key: JWT_GENERATOR_PASSWORD
+        sync: false