Reverted changes to the Dockerfile, fix to env is done by the dc

Student User

2019-08-08 27de9efbe220c3e9b48e04014b11eeb4484f28ce

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var express = require('express');
app = express();
 
app.get('/', function (req, res) {
  res.send('Hello World!\n');
});
 
app.listen(8080, function () {
  console.log('Example app listening on port 8080!');
});