add shebang and update file permissions

etc/ci-setup.sh

+#!/usr/bin/env bash
+
 sudo apt-get -qq update
 sudo apt-get install software-properties-common -y
-curl --fail --retry 3 --retry-delay 1 --connect-timeout 3 --max-time 30 https://cli-assets.heroku.com/install-ubuntu.sh | sh
\ No newline at end of file
+curl --fail --retry 3 --retry-delay 1 --connect-timeout 3 --max-time 30 https://cli-assets.heroku.com/install-ubuntu.sh | sh