[releng] Issue #7502: Release f28/s2i-base container

[Clement Verna]

cverna reported a new issue against the project: `releng` that you are following:
``
candidate-registry.fedoraproject.org/f28/s2i-base is used as based by other images so it
needs to be available in registry.fp.o for the build system to be able to use it. 

Can you release the following tags :                                                      
                                                                                          
            
        "1-1.f28container",                                                     
                                                                                          
                                       
        "1",                                                                    
                                                                                          
                                       
        "latest"

Thanks
``

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https://pagure.io/releng/issue/7502