`CIBW_REPAIR_WHEEL_COMMAND` does not expand `{project}` (and other placeholders)

[LecrisUT]

Could the placeholders be better documented and more consistent? Something like {project} feels like it should be expandable on all commands. I've hit this issue when trying to use before_build and repair-wheel-command

[claudiodsf]

That would be nice if CIBW_REPAIR_WHEEL_COMMAND could expand {project} for things like specifying an absolute path in LD_LIBRARY_PATH.

I currently have to specify it explicitly:

  repair-wheel-command = 'LD_LIBRARY_PATH=/project/external/fftw3/lib auditwheel repair -w {dest_dir} {wheel}'