920a3f5a9d
With the UMask set to 0023, the mkdir -p command which creates the webroot could end up unreadable if the web server changes, as surfaced by the test suite in #114751 On top of this, the following commands to chown the webroot + subdirectories was mostly unnecessary. I stripped it back to only fix the deepest part of the directory, resolving #115976, and reintroduced a human readable error message.
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