Attestations for
  ghcr.io/boks-sh/ruby@sha256:96a181c1440f7c5e0f0f4c57e70a07cf5989fe84e659bd6c6444e53b3e27b542

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/ruby@sha256:96a181c1440f7c5e0f0f4c57e70a07cf5989fe84e659bd6c6444e53b3e27b542

=== 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)