blacksmith.sh: Migrate workflows to Blacksmith

[blacksmith-sh]

This PR migrates some selected workflows to Blacksmith.

[github-actions]

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fix: I fixed something for Unkey

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No release type found in pull request title "blacksmith.sh: Migrate workflows to Blacksmith". Add a prefix to indicate what kind of release this pull request corresponds to. For reference, see https://www.conventionalcommits.org/

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