Use namespace runner for codspeed benchmarks (#2925)

Use namespace runner for codespeed benchmarks
About performances, we almost cut by half the build and benchmark times
with a machine with the same number of cores and the half of RAM.

---------

Co-authored-by: Alexis Placet <2400067+Alex-PLACET@users.noreply.github.com>

Author: Alex-PLACET

.github/workflows/codspeed.yml

@@ -3,10 +3,11 @@ name: CodSpeed
 on:
   push:
     branches: [master]
-  pull_request:
-  # Allow CodSpeed to trigger backtest performance analysis
+  pull_request: # Allow CodSpeed to trigger backtest performance analysis
+
   workflow_dispatch:
 
+
 permissions:
   contents: read
   id-token: write
@@ -22,7 +23,7 @@ defaults:
 jobs:
   benchmarks:
     name: Run benchmarks
-    runs-on: ubuntu-latest
+    runs-on: namespace-profile-benchmark;container.privileged=true;container.host-pid-namespace=true
     steps:
     - name: Checkout code
       uses: actions/checkout@v6