Update ci.yml

Author: jason-fox

.github/workflows/ci.yml

@@ -36,3 +36,8 @@ jobs:
           plugin: 'fox.jason.passthrough.doxygen'
         env:
           COVERALLS_TOKEN: ${{ secrets.COVERALLS_TOKEN }}
+      - uses: actions/upload-artifact@v3
+        if: always()
+        with:
+          name: test-results
+          path: test-results.html