Task #8256: Reverted move of Dockerfile since it is not a binary

Docker/CMakeLists.txt

@@ -36,7 +36,7 @@ lofar_add_sbin_scripts(docker-build-all.sh)
 foreach(_dir ${DOCKER_TEMPLATE_DIRS})
   # _src -> _dst
   set(_src ${CMAKE_CURRENT_SOURCE_DIR}/${_dir}/Dockerfile.tmpl)
-  set(_dst ${CMAKE_BINARY_DIR}/bin/${_dir}_Dockerfile)
+  set(_dst ${CMAKE_CURRENT_BINARY_DIR}/${_dir}_Dockerfile)
 
   # add generating command, and (any) target to force the generation
   # when "all" is build.