Add parallel testing demo

Author: chingc

.github/workflows/parallel.yml

@@ -21,6 +21,9 @@ jobs:
       - name: Setup python
         run: uv python install
 
+      - name: Collect tests
+        run: uv run -- pytest --collect-only --quiet > collected.txt
+
       - shell: uv run -- python {0}
         run: |
           print("hello")