Add the ability to pass extra flags to a build frontend through CIBW_BUILD_FRONTEND #1588
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Fixes #1580.
Adds the ability to pass extra arguments to the build frontend using an option like
CIBW_BUILD_FRONTEND=pip; args: --no-build-isolation
. The mini-syntax is the same as CIBW_CONTAINER_ENGINE.I liked this approach because it adds extra flexibility to the existing CIBW_BUILD_FRONTEND option in a backward-compatible way. Also, options are always going to be different between pip and build, so it makes sense to nest those within this option - if you change the build frontend, you have to change the args too.