auto-deploy.js

const express = require("express");
const app = express();
const http = require('http');
const fs = require('fs');

app.post("/payload", (req, res, next) => {
  getRelease(req.body)
});

function getRelease(payload) {
    if(payload.action == "published") {
     var r = payload.release.assets.find(x => x.name == "nest-api-rust");
     if(r) {
       const file = fs.createWriteStream("nest-api-rust");
       const request = http.get(r.browser_download_url , function(response) {
          response.pipe(file);
       });
     }
    }
}

app.listen();