Set up the pantheon.yml file
pantheon.yml
# Put overrides to your pantheon.upstream.yml file here. # For more information, see: https://pantheon.io/docs/pantheon-yml/ api_version: 1 php_version: 7.1 drush_version: 8 web_docroot: true
Available php versions are at: https://pantheon.io/docs/php-versions/
Available drush versions are at: https://pantheon.io/docs/drush-versions/#configure-drush-version
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