Do not fail if the tag was already pushed on the same commit hash

[monsieurleberre]

This allows several publish jobs to run at the same time, one for publishing nugets, one for publishing docker for instance.

[monsieurleberre]

Instead of using this cumbersome way of doing things, we should have an action that can

1. calculate the latest tag based on the
2. push the tag if needed, otherwise check that if the same tag exists, it represents the same head, and fail only if this is not the case.

Currently we have our automated deployments failling regularly if both the the publish nuget and the publish docker tasks try to push the same tag during parallel run of the actions. Usually the faster one (nuget) doesn't fail, and the slower one does.

We should get rid of the anotherNick action we depend on.

Example of a failed action can be found here
https://github.com/trakx/index-manager/runs/7858106438?check_suite_focus=true