Add CONFIG_BUILD as a dependency to the Makefile

[ghost]

If a user changes something in CONFIG_BUILD, the Makefile should trigger a call to bootstrap.sh to createrepo and pull in RPMs into the new directories.

Currently, this has to be done manually by users.

[ghost]

I need to give this some more thought, but we can add a target to the Makefile for CONFIG_BUILD, which calls ./bootstrap.sh. We then need to add functions to parse CONFIG_BUILD and update the opt directory, rhel directory, and any optional repos.