Cannot load such file "sass" in latest

Nothing fancy, had these for ages:

          - git clone https://github.com/discourse/docker_manager.git
          - git clone https://github.com/joebuhlig/discourse-feature-voting.git
          - git clone https://github.com/discourse/discourse-solved.git
          - git clone https://github.com/discourse/discourse-staff-notes.git
          - git clone https://github.com/discourse/discourse-push-notifications.git
          - git clone https://github.com/discourse/discourse-chat-integration.git
          - git clone https://github.com/discourse/discourse-policy.git
          - cp -R /shared/plugins/buttons buttons
          - git clone https://github.com/discourse/discourse-assign.git
          - git clone https://github.com/discourse/discourse-data-explorer.git
          - git clone https://github.com/angusmcleod/discourse-custom-wizard.git

Buttons is based on the “buttons at the bottom of the page” plugin (I think you wrote that)