Docker: Fixed files being missing from circleci built images

CMakeLists.txt

@@ -26,7 +26,7 @@ cmake_policy(SET CMP0074 NEW) # find_package() uses <PackageName>_ROOT variables
 # Set RPATH-handing (CMake parameters)
 set(CMAKE_SKIP_BUILD_RPATH 0)
 set(CMAKE_BUILD_WITH_INSTALL_RPATH 0)
-set(CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
+list(APPEND CMAKE_INSTALL_RPATH "${CMAKE_INSTALL_PREFIX}/lib")
 set(CMAKE_INSTALL_RPATH_USE_LINK_PATH 1)
 
 # set macro-directory