5c0a06a frontend: disable gpgcheck for external dependencies

Authored and Committed by frostyx 3 years ago
    frontend: disable gpgcheck for external dependencies
    
    Fix #1556
    
    For some reason we use different templates for internal and external
    dependencies (`copr_dir.repo` vs `external_dependency.repo`). I am not
    entirely sure why do we do that and merging them seems reasonable to
    me.
    
    However, as #1556 fix, I think we can just disable gpgcheck for now.