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This patch adds a check that the cloning operation was done properly, with the submodule. If that check fails, it will print a message and then do the proper git submodule command so that the docs-resources/ submodule and any other submodules are properly checked out. If desired, the git command could be removed and it could just print the command to invoke -- I'm open to feedback on that.
The phony target
submodule-check
is only added as a dependency on the build, build-container, and build-no-container targets, which should suffice for most oops-forgot-submodule mistakes.