Fix GeographicLib find_package by adding CMAKE_MODULE_PATH

- Add /usr/share/cmake/geographiclib to CMAKE_MODULE_PATH
- This allows CMake to find FindGeographicLib.cmake from system package
- Required for DEB build in Docker container

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

qt6-after/qt6-migrated-legatus/Lts/Common/LtsCoordTrans/CMakeLists.txt

@@ -13,6 +13,8 @@ else()
 endif()
 
 
+# Add system GeographicLib Find module path
+list(APPEND CMAKE_MODULE_PATH /usr/share/cmake/geographiclib)
 FIND_PACKAGE(GeographicLib)
 NGL_ADD_LIBRARY2(LtsCoordTrans WS AAR SV HLA SHARED
   lts_coord_trans.h