wait for it script added

Backend/wait-for-it.sh

@@ -0,0 +1,20 @@
+#!/bin/sh
+
+host=$1
+port=$2
+timeout=${3:-15} # Timeout por defecto de 15 segundos
+
+start_time=$(date +%s)
+
+while ! nc -z "$host" "$port"; do
+  sleep 1
+  elapsed_time=$(( $(date +%s) - start_time ))
+
+  if [[ $elapsed_time -ge $timeout ]]; then
+    echo "Timeout while waiting for $host:$port" >&2
+    exit 1
+  fi
+done
+
+echo "$host:$port is available"
+exit 0