execute docker everytime

Author: Murmele

doc/CMakeLists.txt

@@ -13,6 +13,7 @@ if(BUILD_DOCUMENTATION)
     configure_file(${doxyfile_in} ${doxyfile} @ONLY)
 
     add_custom_target(doc
+        ALL
         COMMAND ${DOXYGEN_EXECUTABLE} ${doxyfile}
         WORKING_DIRECTORY ${CMAKE_CURRENT_BINARY_DIR}
         COMMENT "Generating API documentation with Doxygen"