Exactly. I manage a CI infrastructure for a mobile game company (28 macs, a few Linux and windows VMs). I still can‘t use docker because our main development box is still macOS. We are slowly moving this to Linux. The reasons why we are still using macs as the main build machines are manyfolded. I know that android SDK and Unity run on Linux but our whole company came from a iOS first model and still uses macOS as the primary development box. But even docker would not help 100%. I have a strong emphasis that the tools run locally as well. And we have a mix of build and development tools. What I mean is that one and the same basic script should be used both during CI and differently with other parameters during development. Jenkins is our build executor. The whole build is setup with gradle as it had 5 years ago some very nice properties over other tools (self bootstrapping, robust plugin system, lots of libraries available). We build everything around this and only use Jenkins-pipelines to kick of said gradle jobs. But I would prefer a nicer solution. Ah we manage the machines with ansible (Mac, windows and Linux) I guess redhad had not thought about the fact that someone took the Multiplattform claims to the test. I can say it is kind of a nightmare to Code playbooks and roles against three different OS types.