measure walltime in ci

Author: d-v-b

.github/workflows/codspeed.yml

@@ -3,7 +3,7 @@ name: CodSpeed Benchmarks
 on:
   push:
     branches:
-      - "main" # or "master"
+      - "main"
   pull_request:
   # `workflow_dispatch` allows CodSpeed to trigger backtest
   # performance analysis in order to generate initial data.
@@ -12,7 +12,7 @@ on:
 jobs:
   benchmarks:
     name: Run benchmarks
-    runs-on: ubuntu-latest
+    runs-on: codspeed-macro
     steps:
     - uses: actions/checkout@v5
       with:
@@ -26,5 +26,5 @@ jobs:
     - name: Run the benchmarks
       uses: CodSpeedHQ/action@v4
       with:
-          mode: instrumentation
+          mode: walltime
           run: hatch run test.py3.11-1.26-minimal:pytest tests/benchmarks --codspeed