Fix wheels workflow failures: smoke_test path and FFTW package name

[Copilot]

Problem

The wheels workflows were failing on both macOS and Linux platforms:

1. macOS wheels: Tests failed with "file not found" error when trying to run ci/smoke_test.py
2. Linux wheels: Build failed because FFTW library was not being installed in manylinux containers

Root Causes

macOS Issue

The test-command in pyproject.toml used a relative path (python ci/smoke_test.py). When cibuildwheel runs tests, it executes them from the installed wheel's site-packages directory, not the source directory, causing the test script to be unreachable.

Linux Issue

The ci/linux_before_all.sh script attempted to install the fftw package, but in manylinux_2_28 containers (based on AlmaLinux 8), the runtime library package is named fftw-libs, not fftw.

Solution

Fixed macOS wheels

Changed the test command to use cibuildwheel's {project} placeholder:

-test-command  = "python ci/smoke_test.py"
+test-command  = "python {project}/ci/smoke_test.py"

The {project} placeholder references the source directory, allowing tests to locate the smoke test file regardless of the current working directory.

Fixed Linux wheels

Updated the package name in the install script:

-$PM -y install ... fftw fftw-devel ...
+$PM -y install ... fftw-libs fftw-devel ...

This ensures FFTW is properly installed in manylinux_2_28 containers using the correct package name.

Testing

These changes are minimal and use standard practices:

• The {project} placeholder is a documented cibuildwheel feature for accessing source files during testing
• The fftw-libs package name is the correct runtime library package for AlmaLinux 8-based containers

The build-test workflow continues to work correctly as it uses $GITHUB_WORKSPACE/ci/smoke_test.py, which is appropriate for that context.

Original prompt

The build-test workflow completes successfully, but the wheels workflows have errors. the macos-versions fail to find smoke_test.py file at the end. The linux-versions fail to locate fftw. Please fix

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