Attestations for
  ghcr.io/boks-sh/gcc@sha256:42a7d4ec5e357b5665ef4f9f6e13f0b9ec6f5f2306537ab68fd049f91aa08489

Verify them yourself:
  cosign verify-attestation --key cosign.pub \
      --type <cyclonedx|slsaprovenance> ghcr.io/boks-sh/gcc@sha256:42a7d4ec5e357b5665ef4f9f6e13f0b9ec6f5f2306537ab68fd049f91aa08489

=== 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)