Run Drush commands when Drupal deployment image is updated

[geerlingguy]

If the Drupal deployment image is updated, then we should at minimum run the following Drush commands:

1. drush updb -y
2. drush csim -y (or drush cim -y if not using Config Split)
3. drush cr

Maybe just updb and cr as defaults, but it would be best if the command list were overridable.

[geerlingguy]

Related: #9 ‚ since the default Drupal image from Docker Hub doesn't include Drush.

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