Use drush launcher and drush8 in container, fixes #1488 #1638
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The Problem/Issue/Bug:
#1488: "Drush launcher" has become the standard way to globally-launch drush. It picks up a site-local drush (the standard technique for drupal8) and with this installation falls back to using drush8, which will work for Drupal7 and Backdrop.
How this PR Solves The Problem:
Change the install to install drush launcher and drush8
Manual Testing Instructions:
Automated Testing Overview:
Related Issue Link(s):
Release/Deployment notes: