Attestations for
  ghcr.io/boks-sh/mkdocs@sha256:a90bddba8357729cdab26bbe1838164e000187603cddbf19b42bab8e22e3913b

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/mkdocs@sha256:a90bddba8357729cdab26bbe1838164e000187603cddbf19b42bab8e22e3913b

=== cyclonedx ===================================================
  (no attestation matches the document published now -- 1 older one(s) are attached)

=== slsaprovenance ==============================================
  (no attestation matches the document published now -- 1 older one(s) are attached)