How to deploy to aws with arc

GitLab CI/CD
,
1

We are trying to deploy a software to AWS. GitLab instructs us to use the ready-made image with AWS CLI installed. To make the installation we would like to use arc command from @architecture/architecture.

Basically we would like our job to be:

deploy_staging:
  stage: deploy
  image: registry.gitlab.com/gitlab-org/cloud-deploy/aws-base:latest
  script:
    - echo "Deploying to Staging"
    - arc deploy --staging --prune
  environment:
    name: staging
    url: https://staging.example.com
  only:
    - main
  variables:
    AWS_ACCESS_KEY_ID: $AWS_ACCESS_KEY_ID
    AWS_SECRET_ACCESS_KEY: $AWS_SECRET_ACCESS_KEY

Unfortunately arc is not available in the aws-base image, nor is npm so we can’t just run npm install @architecture/architecture. What is the proper way of installing arc in this kind of a setup? Or are we even doing it right?