load trending images from tmdb at startup

- need TMDB_API_KEY as environment variable
- mount /cache for data persistence

Signed-off-by: Peter Siegmund <developer@mars3142.org>

server/cinema/lib/common/domain/serializers.dart

@@ -0,0 +1,20 @@
+import 'package:built_collection/built_collection.dart';
+import 'package:built_value/serializer.dart';
+import 'package:built_value/standard_json_plugin.dart';
+import 'package:cinema/feature/poster/domain/movie.dart';
+import 'package:cinema/feature/poster/domain/tmdb_trending_response.dart';
+
+import 'custom_date_time_serializer.dart';
+
+part 'serializers.g.dart';
+
+@SerializersFor([TmdbTrendingResponse, TmdbMovieResult])
+final Serializers serializers =
+    (_$serializers.toBuilder()
+          ..add(CustomDateTimeSerializer())
+          ..addPlugin(StandardJsonPlugin())
+          ..addBuilderFactory(
+            const FullType(BuiltList, [FullType(TmdbMovieResult), FullType(Movie)]),
+            () => ListBuilder<TmdbMovieResult>(),
+          ))
+        .build();