Status Quo
We're using any of the fat-images (e.g. circleci/php:7.1-node-browsers) to run small jobs like building a docker container. These images take a long time to start up (download, extract, start).
Provide an alpine base images with all the tools installed as described in the CircleCI documentation (e.g. docker). This will
Reduce start time
Reduce strain on CircleCI infrastructure