feat: Add ability to attest the supplied multi-arch image #4912

Job	Run time
verify no checkout in Actions	3s
check-dist-matrix (.github/actions/compute-sha256)	13s
check-tscommon-tarball	13s
check-dist-matrix (.github/actions/privacy-check)	19s
check-dist-matrix (.github/actions/generate-attestations)	18s
check-dist-matrix (.github/actions/sign-attestations)	18s
check-dist-matrix (.github/actions/create-container_based-predicate)	19s
compute-sha256	7s
references	4s
check-dist-matrix (./actions/delegator/setup-generic)	21s
check-dist-matrix (.github/actions/verify-token)	26s
rng	5s
check-dist-matrix (.github/actions/detect-workflow-js)	20s
secure-download-artifact	6s
secure-download-artifact-builder-name	5s
secure-download-artifact-builder-repo-folder	6s
secure-project-checkout-go	5s
secure-project-checkout-node	7s
secure-upload-folder	25s
generate-attestations	3s
generate-builder-generic-no-compile	10s
generate-builder-generic-compile	1m 25s
secure-download-artifact-builder-repo-file	5s
check-dist	1s
	5m 44s

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