Build: disable composer plugins and scripts execution

The nightly builds process runs as root from a cron job. This throws a
warning when executing composer.

Add recommended [1] parameters to composer install command.

Fixes #22644

[1] in https://getcomposer.org/root

buildrelease-repo.py

@@ -161,7 +161,7 @@ def main():
         # Composer
         if path.isfile('composer.json'):
             print "Installing Composer packages"
-            if subprocess.call('composer install', shell=True):
+            if subprocess.call('composer install --no-plugins --no-scripts', shell=True):
                 continue
             print