Preserve file permission when installing using composer project

[hansfn]

Composer project ensures that the files directory (and maybe the sync directory when my PR gets approved) has correct permission. However, the build-composer-project task uses cp -r which doesn't preserve permission. Since umask is 022 it kills the writable bits. The easy fix is to add -p to the cp command.

PS! Windows users that uses the default vagrant_synced_folders setting doesn't experience this problem as the sync forces writable files and directories on Linux - probably because the different permission model on Linux and Windows. It took me a while to understand what was going on when I disabled syncing (to get better performance) and Drupal suddenly lost all styling ...

[geerlingguy]

@hansfn - Thanks so much for the PR, and the excellent, concise description! Could you please file the same PR against the upstream geerlingguy.drupal repository here: https://github.com/geerlingguy/ansible-role-drupal

Then I'll tag a new release of that project, and include the updated version into Drupal VM. Thanks!