Add support for attestations

[remyleone]

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Description

It would be helpful to add support for providing attestations about the scaleway-cli using native github features https://docs.github.com/en/actions/how-tos/secure-your-work/use-artifact-attestations/use-artifact-attestations

How I imagine scw could expose this functionality

References

• https://goreleaser.com/customization/publish/attestations/