Upgrading Probo instance php version to 5.6 for Drupal 8.x

.probo.yml

- name: Upgrade to php 5.6
    plugin: Script
    script: |
      sudo apt-get update
      sudo apt-get install -y software-properties-common language-pack-en-base
      LC_ALL=en_US.UTF-8 add-apt-repository ppa:ondrej/php
      LC_ALL=en_US.UTF-8 add-apt-repository ppa:ondrej/apache2
      apt-get update
      sudo apt-get install -y php5.6 php5.6-mbstring php5.6-mcrypt php5.6-mysql php5.6-xml php5.6-gd php5.6-curl php5.6-json php5.6-imagick php5.6-dev php5.6-gmp
      sudo a2dismod php5
      sudo a2enmod php5.6
      apachectl graceful
      php -v