Qt6: CI macos-bundle: copy libboost_system

cmake/Deploy.cmake

@@ -37,6 +37,17 @@ if(APPLE OR (WIN32 AND NOT STATIC))
             )
         endif()
 
+        # libbost_chrono-mt.dylib has a dependency on libboost_system-mt.dylib, maydeployqt does not copy it by itself
+        find_package(Boost COMPONENTS system)
+        get_target_property(BOOST_SYSTEM_LIB_PATH Boost::system LOCATION)
+        if(EXISTS ${BOOST_SYSTEM_LIB_PATH})
+            add_custom_command(TARGET deploy
+                               POST_BUILD
+                               COMMAND ${CMAKE_COMMAND} -E copy "${BOOST_SYSTEM_LIB_PATH}" "$<TARGET_FILE_DIR:monero-wallet-gui>/../Frameworks/"
+                               COMMENT "Copying libboost_system-mt.dylib"
+            )
+        endif()
+
         # Apple Silicon requires all binaries to be codesigned
         find_program(CODESIGN_EXECUTABLE NAMES codesign)
         if(CODESIGN_EXECUTABLE)