How to set up cross-account deploymetn fromCodeCommit repo to EC2 instance in another account

Hi there, Thanks for reading. I was asked to set up a cross-account deployment process. We have CodeComint repo in one account and we want to deploy any changes to EC2 instance in another account. It is a Drupal website that we are hosting in the EC2 instance with S3 bucket for the media files and RDS instance for the DB. I amnot sure how to approach it and how the whole process should look like. I will appreciate any tips. Thanks.