add reverse-dns

lib/logic/api_maps/hetzner.dart

@@ -192,4 +192,20 @@ class HetznerApi extends ApiMap {
 
     return HetznerServerInfo.fromJson(response.data!['server']);
   }
+
+  Future<void> createReverseDns({
+    required String ip4,
+    required String cloudFlareDomain,
+  }) async {
+    var hetznerServer = getIt<ApiConfigModel>().hetznerServer;
+    var client = await getClient();
+    await client.post(
+      '/servers/${hetznerServer!.id}/actions/change_dns_ptr',
+      data: {
+        "ip": ip4,
+        "dns_ptr": cloudFlareDomain,
+      },
+    );
+    close(client);
+  }
 }

lib/logic/cubit/app_config/app_config_repository.dart

@@ -149,7 +149,7 @@ class AppConfigRepository {
   }
 
   Future<void> createDnsRecords(
-    String? ip4,
+    String ip4,
     CloudFlareDomain cloudFlareDomain,
   ) async {
     var cloudflareApi = CloudflareApi();
@@ -163,6 +163,11 @@ class AppConfigRepository {
       ip4: ip4,
       cloudFlareDomain: cloudFlareDomain,
     );
+
+    await HetznerApi().createReverseDns(
+      ip4: ip4,
+      cloudFlareDomain: cloudFlareDomain.domainName,
+    );
   }
 
   Future<bool> isHttpServerWorking() async {