4aacad5 Add the initial gpg signature check code

Authored and Committed by puiterwijk 2 years ago
    Add the initial gpg signature check code
    
    This does implement verification of signatures on commits and tags.
    It does not implement getting the keys from a keyserver, verifying
    the key is owned by the user, or any UI to indicate signature state.
    
    Signed-off-by: Patrick Uiterwijk <puiterwijk@redhat.com>
    
        
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