Add integration test script

frontend/test-client/run.sh

@@ -0,0 +1,21 @@
+#!/bin/bash
+
+set -e
+
+npm run build
+
+pids=()
+for i in {1..10}; do
+    node dist/cli.js 2>&1 | tee "log_${i}.log" &
+    pids+=($!)
+done
+
+trap 'kill ${pids[@]} 2>/dev/null' SIGINT SIGTERM
+
+for pid in ${pids[@]}; do
+    if ! wait $pid; then
+        kill ${pids[@]} 2>/dev/null
+        echo "Process $pid failed, see log_$(echo ${pids[@]} | tr ' ' '\n' | grep -n "^$pid$" | cut -d: -f1).log"
+        exit 1
+    fi
+done