Dockerfile: move to using our pre-built image
Created by: rjw57
Rather than starting from a naked Python image, use our upstream Django 2.1 and Python 3.7 image to speed build times.
GitLab will be updated on 12-Feb-2026 between 12:00 and 14:00. There may be small periods of service instability.
Created by: rjw57
Rather than starting from a naked Python image, use our upstream Django 2.1 and Python 3.7 image to speed build times.