server: bench: create a script to wrap all operations

.github/workflows/bench.yml

@@ -102,6 +102,7 @@ jobs:
           cd examples/server/bench
           source venv/bin/activate
           BENCH_K6_BIN_PATH=./k6 python bench.py \
+              --runner-label ${{ env.RUNNER_LABEL }} \
               --name ${{ github.job }} \
               --branch ${{ github.ref_name }} \
               --commit ${{ github.sha }} \