Explicitly fetch submodules on check
Explicitly fetch submodules on check

SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io,SpineEventEngine/SpineEventEngine.github.io