Merge pull request 'dns healthcheck' (#9) from refactor into main

Reviewed-on: #9

scripts/deploy-to-gateway.sh

@@ -120,13 +120,23 @@ dns_health_check() {
   fi
 }
 
-echo "Running DNS health check ($DNS_CHECK_DOMAIN via $DNS_LISTEN_ADDR)..."
-if ! dns_health_check; then
-  echo "Error: DNS health check failed — Pi-hole not responding on $DNS_LISTEN_ADDR"
+echo "Running DNS health check ($DNS_CHECK_DOMAIN via $DNS_LISTEN_ADDR, up to 15 attempts)..."
+dns_ok=false
+for i in $(seq 1 15); do
+  if dns_health_check; then
+    dns_ok=true
+    echo "DNS health check passed (attempt $i)"
+    break
+  fi
+  echo "  attempt $i failed, retrying in 1s..."
+  sleep 1
+done
+
+if ! $dns_ok; then
+  echo "Error: DNS health check failed after 15 attempts — Pi-hole not responding on $DNS_LISTEN_ADDR"
   rollback
   exit 1
 fi
-echo "DNS health check passed"
 
 # ==============================
 # Очистка IPSET