feat: add support for container_engine=none

[mayeut]

No description provided.

[Copilot]

Pull request overview

Adds a new Linux mode where CIBW_CONTAINER_ENGINE=none disables OCI container usage and runs the Linux build “natively” (e.g., inside a manylinux runner/container), with corresponding path-handling and test/CI adjustments.

Changes:

• Allow OCIContainerEngineConfig.from_config_string("none") to resolve to None, and thread this through BuildOptions/Linux build steps.
• Introduce a Linux “builder” abstraction to support both OCIContainer and a new LocalBuilder execution path.
• Update unit/integration tests and CI workflow to exercise/skip container-image-specific behavior when container_engine=none.

Reviewed changes

Copilot reviewed 19 out of 20 changed files in this pull request and generated 6 comments.

Show a summary per file

File	Description
unit_test/options_test.py	Adjusts assertions for container_engine typing in options parsing tests.
unit_test/option_prepare_test.py	Updates monkeypatching to target create_builder rather than OCIContainer directly.
unit_test/oci_container_test.py	Updates tests to use remote-path types and narrows engine config typing via assertions.
unit_test/linux_build_steps_test.py	Updates test typing to allow container_engine to be optional.
test/utils.py	Tweaks test helpers to skip musllinux expectations/builds when container engine is disabled.
test/test_musllinux_X_Y_only.py	Skips musllinux image test when CIBW_CONTAINER_ENGINE=none.
test/test_manylinuxXXXX_only.py	Skips manylinux image test when CIBW_CONTAINER_ENGINE=none.
test/test_linux_python.py	Skips interpreter-existence test when CIBW_CONTAINER_ENGINE=none.
test/test_container_images.py	Skips container image tests when CIBW_CONTAINER_ENGINE=none.
test/test_container_engine.py	Skips create-args container test when CIBW_CONTAINER_ENGINE=none; keeps podman gating.
test/test_before_build.py	Makes Linux-specific cwd assertion conditional on actually using a container.
test/test_before_all.py	Makes Linux-specific cwd assertion conditional on actually using a container.
test/conftest.py	Skips docker warmup/cleanup fixtures when CIBW_CONTAINER_ENGINE=none.
cibuildwheel/util/file.py	Adds RemotePosixPath/RemoteWindowsPath marker path types for “remote FS” operations.
cibuildwheel/typing.py	Adds PathT TypeVar used for typed path-preserving glob methods.
cibuildwheel/platforms/linux.py	Implements Builder protocol, LocalBuilder, and create_builder; adapts build flow to optional container usage.
cibuildwheel/options.py	Makes BuildOptions.container_engine optional.
cibuildwheel/oci_container.py	Supports container_engine=none and strengthens remote path typing for copy/glob operations.
bin/run_tests.py	Avoids running docker unit tests when CIBW_CONTAINER_ENGINE=none.
.github/workflows/test.yml	Adds a CI job to run Linux tests/build with CIBW_CONTAINER_ENGINE=none.

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