Attestations for
  ghcr.io/boks-sh/ruby@sha256:62b8a7e2d8ef418c1831844301f31890000200de8eb6a583c4a470d34d55e7b1

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/ruby@sha256:62b8a7e2d8ef418c1831844301f31890000200de8eb6a583c4a470d34d55e7b1

=== cyclonedx ===================================================
  (no attestation matches the document published now -- 0 older one(s) are attached)

=== slsaprovenance ==============================================
  (no attestation matches the document published now -- 0 older one(s) are attached)