You can use a own docker image to test your project. The image must meet the following requirements:

• ssh-daemon with simpleci:simpleci user:password (for worker)
• Allow to run sudo for user simpleci without password confirmation
• Installed programms: git (for git repository), hashdeep (if you use cache)

• php - Image for testing php projects. Include a php 5,6, 7.0 (managed by phpbrew), nodejs, yarn, java, chromium. PHP versions are managed using phpbew.
• python - Image for testing python projects. Include a python 2.7, 3.3, 3.4, 3.5 (managed by pyenv).