Focal build environment

We are delighted to announce that we now support Ubuntu Focal Fossa 20.04 images to power your builds.

Following the release, we’ll incorporate your feedback for the Ubuntu Focal Fossa 20.04 image on a weekly basis during the next two months so that bug fixes and any improvements get into the image as soon as possible.

Ubuntu 20.04 on Travis has CMake version 3.12?
I see major projects using minimum CMake 3.15 for many months. Since Ubuntu 20.04 comes with CMake 3.16, it would be preferable to have a more usable, modern CMake version in Travis Focal image. Thanks.

@scivision thank you for your remark!
The CMake used is 3.16.8 now in Travis CI Focal image.

PyPy is not available for Focal.

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Don’t want to start a new topic, this seems like the right place. I used to install Docker from the official Docker repo on Bionic for buildx/BuildKit support (19.03 is required). 19.03 is installed on Focal by default, but buildx doesn’t seem to work. I think it must be installed as a plugin or something? Haven’t run into this issue before on my local Docker instances. It’s pretty much required for multi-architecture Docker builds.

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