[BUG] Build now fails due to sites/default being unwritable

[alxp]

Noticed a build failure when I pushed a commit to an open ISLE-DC PR this evening. Log is here.

Notice: ] Performed install task: install_select_profile
Notice: ] Performed install task: install_load_profile

In install.core.inc line 2329:
																			   
  Settings file:The <em class="placeholder">Settings file</em> is not writabl  
  e.<br /><br />The Drupal installer requires write permissions to <em class=  
  "placeholder">./sites/default/settings.php</em> during the installation pro  
  cess. The <a href="https://www.drupal.org/server-permissions">webhosting is  
  sues</a> documentation section offers help on this and other topics.         
																			   

make[1]: *** [Makefile:580: starter-finalize] Error 1
make[1]: Leaving directory '/home/runner/work/isle-dc/isle-dc'
make: *** [Makefile:159: starter] Error 2
Error: Process completed with exit code 2.
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```shell

I know we've dealt with similar issues in the past, is it a matter of doing another chmod / chown?

[joshdentremont]

This might be the same issue here: #306

We talked about chown in the tech call, but in my testing, the owner didn't have permission to write to settings.php, so I think we would need to also give the owner write permissions.

[adam-vessey]

Something such as Drupal's $settings['skip_permissions_hardening'] setting might be useful; though, would only expect it to be used in dev environments.