Al menos 5GB de RAM, traté con 1G de RAM y 4G de SWAP, funcionó.
Instalar Drupal
Modificar /var/www/html/drupal/composer.json
"repositories": [ { "type": "composer", "url": "https://packages.drupal.org/8" }, { "type": "git", "url": "https://github.com/ParallelDevs/e_invoice_cr.git" } ],
Instalar:
composer require swiftmailer/swiftmailer:5.4.12 composer require 'drupal/swiftmailer:^1.0' composer require drupal/Field_group composer require drupal/Addressfield_cr composer require drupal/Paragraphs composer require drupal/Entity_print composer require drupal/Twig_field_value composer require paralleldevs/e_invoice_cr
En el siguiente estricto orden: