Don't retag redeploys

[tute]

It would be great if redeploying commits wouldn't produce more tags.

Thank you for your useful script!

[gavinheavyside]

Retagging, even if the git SHA hasn't changed, is a deliberate design decision. Consider a production deployment where we add a server to an existing cluster. We need to deploy the code to this new server, but the git SHA hasn't changed since the last deploy to a different set of servers. We absolutely want to know about the two distinct deploys, even though the code hasn't changed, so we tag all deploys.

[tute]

Makes sense, thank you!