fixup: add stress-ng test

Author: not-matthias

.github/workflows/codspeed.yml

@@ -19,6 +19,8 @@ jobs:
           - echo Hello, World!
           - ls fib.py
           - python3 fib.py
+          - stress-ng --cpu 1 --timeout 1s
+          - stress-ng --cpu 4 --timeout 1s
         valgrind:
           - "3.26.0"
           - "3.25.1"
@@ -79,7 +81,7 @@ jobs:
 
           # Ensure libc6-dev is installed for Valgrind to work properly
           sudo apt-get update
-          sudo apt-get install -y libc6-dev
+          sudo apt-get install -y libc6-dev stress-ng
 
       - name: Verify Valgrind build
         run: /usr/local/bin/valgrind --version