message: guix-attest: Only use cross-platform flags for find+xargs
diff: @@ -145,7 +145,13 @@ for outdir in "${OUTDIRS[@]}"; do
  echo "${outname}: Hashing build outputs to produce SHA256SUMS"
  (
  cd "$outdir"
  - find . -type f -printf '%P\0' | env LC_ALL=C sort -z | xargs -r0 sha256sum >> "$outsigdir"/SHA256SUMS
  + files="$(find . -type f)"
  + if [ -n "$files" ]; then
  + cut -c3- <<< "$files" | env LC_ALL=C sort | xargs sha256sum >> "$outsigdir"/SHA256SUMS
  + else
  + echo "ERR: ${outname}: No outputs found in '${outdir}'"
  + exit 1
  + fi
  )
  echo "${outname}: Signing SHA256SUMS to produce SHA256SUMS.asc"
  gpg --detach-sign --local-user "$gpg_key_name" --output "$outsigdir"/SHA256SUMS.asc "$outsigdir"/SHA256SUMS
  