Ensure release publish workflow can only run from last RC (#3290) #3295
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This PR adds a safety check in the 4th release workflow that publishes artifacts after a vote has passed for a given RC. When the workflow is run, it verifies that it is running on a
release/[major].[minor].xbranch and that the head of that branch corresponds to the last RC tag. That second condition ensures that no new commit has been added since the vote started for the last RC. It is necessary because part of publishing involves rebuilding Polaris Docker images, so the source code must be identical to the RC.Marking this PR as draft given that it has not been tested yet.