feat(EnvelopeReceiverReadOnly): Controller initialisieren

- Join mit Receiver und Read
 - DI-Konfiguration hinzufügen
 - Auslöser hinzufügen (TBSIG_ENVELOPE_RECEIVER_READ_ONLY_UPD)

EnvelopeGenerator.Infrastructure/Repositories/EnvelopeReceiverReadOnlyRepository.cs

@@ -1,6 +1,7 @@
 using DigitalData.Core.Infrastructure;
 using EnvelopeGenerator.Domain.Entities;
 using EnvelopeGenerator.Infrastructure.Contracts;
+using Microsoft.EntityFrameworkCore;
 
 namespace EnvelopeGenerator.Infrastructure.Repositories
 {
@@ -9,5 +10,12 @@ namespace EnvelopeGenerator.Infrastructure.Repositories
         public EnvelopeReceiverReadOnlyRepository(EGDbContext dbContext) : base(dbContext, dbContext.EnvelopeReceiverReadOnlys)
         {
         }
+
+        protected override IQueryable<EnvelopeReceiverReadOnly> ReadOnly()
+        {
+            return base.ReadOnly()
+                .Include(erro => erro.Envelope)
+                .Include(erro => erro.Receiver);
+        }
     }
 }