[py] Added scikit-build.

Build with:

```
pip install .
```

.gitignore

@@ -38,4 +38,8 @@ CMakeUserPresets.json
 nohup.out
 
 /Documentation/.vale
+
+# Python build
+/_skbuild
+*.egg-info/
 .ipynb_checkpoints

pyproject.toml

+[build-system]
+requires = [
+  "setuptools>=42",
+  "scikit-build>=0.15.0",
+  "cmake>=3.22",
+  "ninja; platform_system!='Windows'",
+]
+build-backend = "setuptools.build_meta"

scripts/cmake/packaging/Pack.cmake

@@ -76,7 +76,9 @@ if(OGS_USE_PYTHON)
         install(FILES ${PYTHON_RUNTIME_LIBS} DESTINATION bin)
         file(COPY ${PYTHON_RUNTIME_LIBS} DESTINATION ${CMAKE_RUNTIME_OUTPUT_DIRECTORY})
     else()
-        install(FILES ${Python_LIBRARIES} DESTINATION bin)
+        file(INSTALL ${Python_LIBRARIES} DESTINATION ${CMAKE_INSTALL_LIBDIR}
+             FOLLOW_SYMLINK_CHAIN
+        )
     endif()
 endif()
 

setup.py

+from skbuild import setup
+from setuptools import find_packages
+
+setup(
+    name="ogs",
+    version="6.4.2",
+    description="OpenGeoSys",
+    author="OpenGeoSys Community",
+    license="BSD-3-Clause",
+    packages=find_packages(where="."),
+    package_dir={"": "."},
+    cmake_args=["-DOGS_BUILD_PROCESSES=SteadyStateDiffusion", "-DOGS_BUILD_UTILS=OFF"],
+    python_requires=">=3.6",
+)