Calculate confidence interval for benchmark measurements

.github/workflows/osrm-backend.yml

@@ -725,9 +725,9 @@ jobs:
         run: |
           # we intentionally use scripts from PR branch to be able to update them and see results in the same PR
           ./pr/scripts/ci/run_benchmarks.sh -f $(pwd)/base -r $(pwd)/base_results -s $(pwd)/pr -b $(pwd)/base/build -o ~/data.osm.pbf -g ~/gps_traces.csv
-          
+
       - name: Run PR Benchmarks 
-         run: |
+        run: |
           ./pr/scripts/ci/run_benchmarks.sh -f $(pwd)/pr -r $(pwd)/pr_results -s $(pwd)/pr -b $(pwd)/pr/build -o ~/data.osm.pbf -g ~/gps_traces.csv
           
       - name: Post Benchmark Results