Show job outputs from check-upstream.

.github/workflows/main.yml

@@ -56,6 +56,12 @@ jobs:
             echo "new_release_exists=true" >>"$GITHUB_OUTPUT"
           fi
           
+      - name: Show Output
+        id: show-output
+        run: |
+          echo "## Job Outputs" >>"$GITHUB_STEP_SUMMARY"
+          sed -e 's;^.*;* `\0`;' "$GITHUB_OUTPUT" >>"$GITHUB_STEP_SUMMARY"
+
   build-deb:
     name: Build DEB Packages
     runs-on: ubuntu-latest