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What kind of change does this PR introduce?
Migration testing that aligns with the workflow here but able to run locally against 2 versions of pg (currently just 15 -> 15)
This test is run with
nix run .#migration-test <git-tag-only> gitsha-or-gittag> pg_upgrade
We'll deprecate the "major version" as it is too vague to meaningful for the use cases for this tool.
This PR is WIP/Draft at this point, but prior to merging, we'll create specific tags for building and testing previous versions, and retain those in the git repo, and implement the support for gitsha or tag.