fix: improve Python detection in manylinux environment

- Modify faiss CMakeLists.txt to try both FindPython and FindPython3
- Add scikit-build configuration to help with Python detection
- Simplify Linux environment variables in cibuildwheel
- Add CMake Python detection before faiss configuration

packages/leann-backend-hnsw/CMakeLists.txt

@@ -24,6 +24,23 @@ set(MSGPACK_USE_BOOST OFF CACHE BOOL "" FORCE)
 add_compile_definitions(MSGPACK_NO_BOOST)
 include_directories(third_party/msgpack-c/include)
 
+# Find Python before configuring Faiss
+# Check if we're in scikit-build environment
+if(DEFINED SKBUILD)
+    message(STATUS "Building with scikit-build, using provided Python")
+    # scikit-build-core provides Python_* variables
+else()
+    find_package(Python REQUIRED COMPONENTS Interpreter Development NumPy)
+endif()
+
+# Print Python information for debugging
+message(STATUS "Python_FOUND: ${Python_FOUND}")
+message(STATUS "Python_VERSION: ${Python_VERSION}")
+message(STATUS "Python_EXECUTABLE: ${Python_EXECUTABLE}")
+message(STATUS "Python_INCLUDE_DIRS: ${Python_INCLUDE_DIRS}")
+message(STATUS "Python_LIBRARIES: ${Python_LIBRARIES}")
+message(STATUS "Python_NumPy_INCLUDE_DIRS: ${Python_NumPy_INCLUDE_DIRS}")
+
 # Faiss configuration - streamlined build
 set(FAISS_ENABLE_PYTHON ON CACHE BOOL "" FORCE)
 set(FAISS_ENABLE_GPU OFF CACHE BOOL "" FORCE)

packages/leann-backend-hnsw/pyproject.toml

@@ -24,4 +24,5 @@ cmake.verbose = true
 
 # CMake definitions to optimize compilation
 [tool.scikit-build.cmake.define]
-CMAKE_BUILD_PARALLEL_LEVEL = "8"
+CMAKE_BUILD_PARALLEL_LEVEL = "8"
+SKBUILD_SOABI = "YES"