fix(hetzner): Filter away ARM architecture from available servers

- Resolve https://git.selfprivacy.org/SelfPrivacy/selfprivacy.org.app/issues/402

lib/logic/models/json/hetzner_server_info.dart

@@ -79,6 +79,7 @@ class HetznerServerTypeInfo {
     this.prices,
     this.name,
     this.description,
+    this.architecture,
   );
   final int cores;
   final num memory;
@@ -86,6 +87,7 @@ class HetznerServerTypeInfo {
 
   final String name;
   final String description;
+  final String architecture;
 
   final List<HetznerPriceInfo> prices;
 

lib/logic/models/json/hetzner_server_info.g.dart

@@ -83,6 +83,7 @@ HetznerServerTypeInfo _$HetznerServerTypeInfoFromJson(
           .toList(),
       json['name'] as String,
       json['description'] as String,
+      json['architecture'] as String,
     );
 
 Map<String, dynamic> _$HetznerServerTypeInfoToJson(
@@ -93,6 +94,7 @@ Map<String, dynamic> _$HetznerServerTypeInfoToJson(
       'disk': instance.disk,
       'name': instance.name,
       'description': instance.description,
+      'architecture': instance.architecture,
       'prices': instance.prices,
     };
 

lib/logic/providers/server_providers/hetzner.dart

@@ -482,6 +482,9 @@ class HetznerServerProvider extends ServerProvider {
 
     final rawTypes = result.data;
     for (final rawType in rawTypes) {
+      if (rawType.architecture == 'arm') {
+        continue;
+      }
       for (final rawPrice in rawType.prices) {
         if (rawPrice.location == location.identifier) {
           types.add(