We use containers instead of VMs. We give you dedicated build containers (called minions) and the environment is persisted between builds, so packages do not ne

We use containers instead of VMs. We give you dedicated build containers (called minions) and the environment is persisted between builds, so packages do not need to be installed for each build. Also, language runtimes and services are already pre-installed on a container, so we can easily turn on or off as specified by yml file. We use Docker containers for builds/tests and we think all this combined is our magic sauce :)