add workflow summary

.github/workflows/prune.yml

@@ -41,12 +41,24 @@ jobs:
           echo "Fetching Cosign signature tags..."
           SIG_TAGS=$(gh api -H "Accept: application/vnd.github.v3+json" "/orgs/$GH_OWNER/packages/container/$IMAGE_NAME/versions" | jq -r '.[].name | select(test("^sha256-[a-f0-9]+\\.sig$"))')
 
+          PRUNED_SIGS="### Pruned Cosign Signatures\n\n"  # Header for workflow summary
+          SIG_DELETED=false
+
           for SIG in $SIG_TAGS; do
             SIG_DIGEST="${SIG#sha256-}"  # Remove 'sha256-' prefix
             SIG_DIGEST="${SIG_DIGEST%.sig}"  # Remove '.sig' suffix
 
             if ! echo "$REMAINING_DIGESTS" | grep -q "^$SIG_DIGEST$"; then
               echo "Deleting orphaned signature: $SIG"
               # gh api --method DELETE -H "Accept: application/vnd.github.v3+json" "/orgs/$GH_OWNER/packages/container/$IMAGE_NAME/versions/$SIG"
+              PRUNED_SIGS+="- $SIG\n"
+              SIG_DELETED=true
             fi
           done
+
+          # Append to GitHub summary only if signatures were deleted
+          if [ "$SIG_DELETED" = true ]; then
+            echo -e "$PRUNED_SIGS" >> $GITHUB_STEP_SUMMARY
+          else
+            echo "No orphaned signatures found." >> $GITHUB_STEP_SUMMARY
+          fi