* Improve integration test options
- Keep the platform and enable options in os.environ, don't duplicate state in utils
- Provide more user-friendly options for setting enable and platform in integration tests
* Ensure that CIBW_ENABLE is set in the test process
* Use get_enable_groups() where necessary
* fix: enforce minimum version of docker/podman
This allows to always pass `--platform` to the OCI engine
thus fixing issues with multiarch images.
* Allow older versions with warnings
* Upgrade docker on Travis CI
* fix: use `docker cp` instead of `tar`
* Enforce docker>=24.0
* move log to include container.copy_into
* fix: travis-ci, only update docker on aarch64
* skip test_multiarch_image on s390x / ppc64le
* skip flaky test
* chore: only install test deps on Travis CI
* fix: do not try to pull images tagged `cibw_local`
* use "--pull=never" for local images
* Use docker image inspect to check if an image needs to be pulled
* chore: rework single python tests
* chore(tests): limit number of builds in test_abi3
* chore(tests): limit number of builds in test_before_all
* apply review suggestion
use `os.path.samefile` rather than comparing `os.stat` directly.
Joe Rickerby