Hi,

By default, the appveyor host agent builds the Ubuntu 18.04 image. However, I want to use the ubuntu2004 image, which is, unsurprisingly, not the Ubuntu 18.04 image. It's not built by default, so how do I replicate that for my own setup? I saw some scripts on the AppVeyor GH repo, but it's not immediately clear to me how I could use the scripts to build the Ubuntu 20.04 image. Would you please enlighten me on that? It'd be quite helpful, as at least one part of the test suite I run needs the newer mingw version that is first available in 20.04 to check if some version can be cross compiled using Ubuntu 20.04. We already know it doesn't work with Ubuntu 18.04 because the mingw version that it ships with is too old.

Also, do you have any standard way to update the docker images automatically? As far as I am aware, the appveyor host agent does not do that. Are the images used by ci.appveyor.com ever updated?

Kind regards

Noel