guix: temp fix attest script for flatpak

contrib/guix/guix-attest

@@ -121,6 +121,8 @@ if (( ${#sha256sum_fragments[@]} )); then
     for logdir in "${sha256sum_fragments[@]}"; do
         echo "    '$logdir'"
         case "$logdir" in
+            "$LOGDIR_BASE"/*.pack/SHA256SUMS.part)
+                ;;
             "$LOGDIR_BASE"/*-codesigned/SHA256SUMS.part)
                 codesigned_fragments+=("$logdir")
                 ;;
@@ -135,6 +137,8 @@ else
     exit 1
 fi
 
+noncodesigned_fragments+=("$OUTDIR_BASE/x86_64-linux-gnu.pack/SHA256SUMS.part")
+
 ##############
 ##  Attest  ##
 ##############