Rework the way that we tag manifests

[coltfred]

This is the new way of tagging manifests. docker manifest create will not work with attestations, which is on by default.

We're currently disabling attestations using --provenance=false on the docker build command, but this seems cleaner to me anyway and is more future proof.

[github-actions]

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Minimum allowed coverage is 24%

Generated by 🐒 cobertura-action against e37d5a1

[coltfred]

git tag -f docker-v1 1077bc1393367361365ee8f8270b00543d7284a5
git push -f origin docker-v1
Updated tag 'docker-v1' (was 7d972b3)
Total 0 (delta 0), reused 0 (delta 0), pack-reused 0 (from 0)
To github.com:IronCoreLabs/workflows.git
 + 338af1f...1077bc1 docker-v1 -> docker-v1 (forced update)