Attestations for
  ghcr.io/boks-sh/mkdocs@sha256:f490375d59ec0d33b21af6fb3d55392eb518e106c1bcdffc943ef61d0a5a92e3

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/mkdocs@sha256:f490375d59ec0d33b21af6fb3d55392eb518e106c1bcdffc943ef61d0a5a92e3

=== 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)