It’s probably because Actions is a fork of Azure Pipelines, which was originally designed to coordinate runners on Windows (where containers aren’t nearly as fl

It’s probably because Actions is a fork of Azure Pipelines, which was originally designed to coordinate runners on Windows (where containers aren’t nearly as flexible or compatible as they are on Linux). Microsoft came up with some fancy internal magic to have hot pools of ephemeral VMs ready to assign in seconds, which nobody outside can really replicate (I don’t think), and then everyone sits in sadness while they try to debug why their tests run fine on “runner-1” but not on “runner-2”.