WA-CI-010: Script CI system prerequisites

[kitcommerce]

Closes #859.

Summary

• Add script/system_prereqs to install/verify CI system packages (Ubuntu/Debian)
• Update .github/workflows/ci.yml to call the script instead of duplicating apt steps
• Script prints versions for docker, docker compose, and ImageMagick

Client impact

None.

[kitcommerce]

Changes addressed

Root cause identified and fixed: docker-compose vs docker compose

GitHub Actions runners (ubuntu-22.04+/ubuntu-24.04) ship Docker Compose v2 as a plugin (docker compose) rather than the legacy standalone binary (docker-compose). The workarea:services rake task called docker-compose -v in assert_docker_compose_installed!, which failed silently on the runner, causing all service-dependent jobs to time out waiting for Elasticsearch/Mongo/Redis.

Fix in core/lib/workarea/tasks/services.rb

Added a compose_command helper that detects which variant is available (plugin first, then standalone) and uses that in all compose invocations:

def compose_command
  return @compose_command if defined?(@compose_command)
  @compose_command =
    if system('docker compose version > /dev/null 2>&1')
      'docker compose'
    elsif system('docker-compose -v > /dev/null 2>&1')
      'docker-compose'
    end
end

All three methods (up, down, clean) now use #{compose_command} instead of hardcoded docker-compose. The assertion also uses the same detection logic.

Also rebased onto current origin/next.