This directory includes scripts to build the docker container image used for building flutter/flutter in our CI system (currently [Cirrus](cirrus-ci.org)). In order to run the scripts, you have to setup `docker` and `gcloud`. Please refer to the [internal flutter team doc](go/flutter-team) for how to setup in a Google internal environment. After setup, * edit `Dockerfile` to change how the container image is built. * run `./build_docker.sh` to build the container image. * run `./push_docker.sh` to push the image to google cloud registry. This will affect our CI tests.