Fix wheel builds when Eigen is fetched

Include FetchContent before the Eigen fallback path so cibuildwheel can configure on runners without a system Eigen installation.
Drop the no-op pp* skip selector to keep the wheel workflow output clean.

Author: astomodynamics

.github/workflows/publish.yml

@@ -57,7 +57,7 @@ jobs:
         run: python -m cibuildwheel --output-dir wheelhouse
         env:
           CIBW_BUILD: cp310-* cp311-* cp312-* cp313-*
-          CIBW_SKIP: pp* *-musllinux_* *-win32
+          CIBW_SKIP: *-musllinux_* *-win32
           CIBW_ARCHS_LINUX: auto64
           CIBW_ARCHS_WINDOWS: auto64
           CIBW_ARCHS_MACOS: auto64

.github/workflows/wheels.yml

@@ -58,7 +58,7 @@ jobs:
         run: python -m cibuildwheel --output-dir wheelhouse
         env:
           CIBW_BUILD: cp310-* cp311-* cp312-* cp313-*
-          CIBW_SKIP: pp* *-musllinux_* *-win32
+          CIBW_SKIP: *-musllinux_* *-win32
           CIBW_ARCHS_LINUX: auto64
           CIBW_ARCHS_WINDOWS: auto64
           CIBW_ARCHS_MACOS: auto64

CMakeLists.txt

@@ -26,6 +26,7 @@ project(
 )
 
 include(GNUInstallDirs)
+include(FetchContent)
 
 set(CMAKE_CXX_STANDARD 17) # Enforce C++17 as the minimum standard
 set(CMAKE_CXX_STANDARD_REQUIRED ON)  # Enforce C++17 as the minimum standard
@@ -92,9 +93,6 @@ if (CDDP_CPP_CASADI)
   endif()
 endif()
 
-# Enable FetchContent for downloading dependencies
-include(FetchContent)
-
 # autodiff
 set(AUTODIFF_BUILD_TESTS OFF CACHE BOOL "Don't build autodiff tests")
 set(AUTODIFF_BUILD_EXAMPLES OFF CACHE BOOL "Don't build autodiff examples")