Git-Flow: allow changing push order

When finishing a release using git-flow, the current order of pushing to the server is `develop`, then `master`, then the tag.

For users with CI pipelines that start in the order that the pushes happen, it would be useful to be able to change the order so that the tag is the first pushed - that way the CI jobs for the tag can run first.

See https://groups.google.com/g/smartgit/c/LUB3hY1dT28/m/MgMTSg3-AQAJ for more details