sprinters-images

Sprinters Docker images

Images

Ubuntu 26.04

x64

• ubuntu-26.04
• ubuntu-26.04-minimal

arm64

• ubuntu-26.04-arm
• ubuntu-26.04-arm-minimal

Ubuntu 24.04

x64

• ubuntu-24.04
• ubuntu-24.04-slim
• ubuntu-24.04-minimal

arm64

• ubuntu-24.04-arm
• ubuntu-24.04-arm-minimal

Ubuntu 22.04

x64

• ubuntu-22.04
• ubuntu-22.04-slim
• ubuntu-22.04-minimal

arm64

• ubuntu-22.04-arm
• ubuntu-22.04-arm-minimal

Build structure

Both Dockerfiles run the scripts in images/build, which wrap GitHub's runner-images scripts, and are split into stages that BuildKit builds in parallel:

• prepared, system-1, java and system-2 install everything that changes shared state, such as packages, users and profiles. They must run one after another, in the order of GitHub's runner images.
• One stage per self-contained tool (Android SDK, CodeQL, PyPy, ...) installs it in isolation with tool.sh. Each tool is listed in tools.txt, together with the image variants that exclude it.
• build merges the tools into the image with merge.sh, installs the toolcache, and finalizes and cleans up.

tool.sh exports what an installer added, and fails the build if it did more than adding files below /usr and /opt or setting environment variables (apart from PATH). Such installers belong in one of the system stages.

To add a tool, list it in tools.txt, add a stage that runs tool.sh <name> to the Dockerfiles, and mount that stage in the build stage. A single stage can be built with --target, for example docker build -f images/Dockerfile-ubuntu-24.04 --target pypy images.

License

MIT License

Copyright (c) 2026 InfrastructureX GmbH

Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.