This directory includes scripts to build the docker container image used forbuilding flutter/flutter in our CI system (currently [Cirrus](cirrus-ci.org)).
To debug the image locally:* (Optional) edit the `Dockerfile` to change how the container image is built.* Run `./docker_build.sh` to build the container image (`sudo` permission is required)* Run `./docker_attach.sh` to start a container from the image and attach to its internal bash shell. From here, you can invoke shell commands from the`.cirrus.yml` (you will have to manually run any `setup` steps; e.g. the container will not have the Flutter repo cloned yet).