How to install composer-asset-plugin when doing 'vagrant up'?

Question

ubuntu

Good day to all.
I generate the config via puphpet.com . I would like the 'composer-asset-plugin' to be installed when the VM is initialized. As you know, this is done by the team

composer global require "fxp/composer-asset-plugin:~1.0.0"

I wrote a script that I put in the folder puphpet\files\exec-once:

#!/usr/bin/bash
echo "Installing Composer Asset Plugin"
composer global require "fxp/composer-asset-plugin:~1.0.0"

The plugin is installed, but in the /root/.composer folder. When I connect to the virtual machine through vagrant sshand try to execute composer install, I get an error due to the absence of this plugin in the /home/vagrant/.composer folder
Tried to switch user usingexpect

#!/usr/bin/bash
echo "Installing Composer Asset Plugin and Setup GitHub Access Token"
expect -c 'set timeout 3600; spawn su - vagrant; expect "Password:" {send -- "vagrant\r";}; exit 0'
composer global require fxp/composer-asset-plugin:~1.0.0;

It does not reach the plugin installation command. The script just hangs, as if waiting for something.
Who has what ideas? Thanks for the help!