GitLab

Old workflow:

 - Checkout submodule
 - Try to download precompiled assets
   - If downloading fails, compile the checked out submoduke

New workflow:

 - Download precompiled assets if submodule directory is empty
   - If download fails checkout the submodule
   - Compile the submodule
 - If the submodule directory is not empty, compile what is in there

The new workflow makes it easy to have a custom version of the submodule
checked out in the directory and getting everything built correctly.