Add "latest" tags to images if building for the default series for the default OS (HTCONDOR-493)
Add "latest" tags to images if building for the default series for the default OS (HTCONDOR-493)

htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor,htcondor/htcondor