package.json

{
  "name": "sample-pubsub",
  "version": "0.0.1",
  "dependencies": {
    "@google-cloud/pubsub": "^0.18.0"
  }
}

sendNotificationCloudBuild.js

const Buffer = require('safe-buffer').Buffer;
const request = require('request');

const url = 'XXXX';

const options = {
    url: url,
    headers: {
        'User-Agent': 'application/json; charset=UTF-8'
    },
    json: true
};


exports.sendNotification = (event, context) => {
    try {
        console.log('event:', event);
        const messageAsString = Buffer.from(event.data, 'base64').toString();
        console.log(messageAsString);

      	const messageJson = JSON.parse(messageAsString);
      	const parsedMessageJson = {'projectId': messageJson.projectId, 'status': messageJson.status, 'source': messageJson.source,'logUrl' : messageJson.logUrl};
      
      	console.log(parsedMessageJson);
      
      	if(parsedMessageJson.status === 'FAILURE' || parsedMessageJson.status === 'SUCCESS'){
          options.body = {text: JSON.stringify(parsedMessageJson)};

          request.post(options, function (err, response, body) {
              console.log('error:', err);
              console.log('statusCode:', response && response.statusCode);
              console.log('body:', body);
          }); 
        }
    } catch (err) {
        console.log(err);
    }
};