| This directory includes scripts and tools for setting up Flutter's continuous |
| integration environments. |
| |
| ## Cirrus Linux |
| |
| Flutter's Linux tasks run on a custom Docker image. The `Dockerfile` for this |
| image can be found at [/dev/ci/docker_linux/Dockerfile](https://github.com/flutter/flutter/blob/master/dev/ci/docker_linux/Dockerfile). |
| On each new change to this `Dockerfile`, Cirrus will build a new version of |
| the Docker image as a dependency to any Linux tests. It is no longer necessary |
| to manually build and push the Docker image locally. |
| |
| NOTE: there are some factors external to the actual `Dockerfile` that would |
| necessitate rebuilding the Docker image, such as upstream code changes, (Linux |
| distribution) repository updates or a file that gets `COPY`ied into the image |
| changing. In this case, a trivial `Dockerfile` change (such as a comment) |
| would invalidate the cache and trigger a rebuild. |
