Do not regress surface area

Author: tothegills

source/Octopus.Client.Tests/PublicSurfaceAreaFixture.ThePublicSurfaceAreaShouldNotRegress..NETCore.approved.txt

@@ -4986,16 +4986,28 @@ Octopus.Client.Model
   class RetentionPeriod
     IEquatable<RetentionPeriod>
   {
+    .ctor(Octopus.Client.Model.RetentionPeriodStrategy, Int32, Octopus.Client.Model.RetentionUnit)
     .ctor(Int32, Octopus.Client.Model.RetentionUnit)
     Int32 QuantityToKeep { get; }
     Boolean ShouldKeepForever { get; }
+    Octopus.Client.Model.RetentionPeriodStrategy Strategy { get; }
     Octopus.Client.Model.RetentionUnit Unit { get; }
+    static Octopus.Client.Model.RetentionPeriod Default()
     Boolean Equals(Octopus.Client.Model.RetentionPeriod)
     Boolean Equals(Object)
     Int32 GetHashCode()
     static Octopus.Client.Model.RetentionPeriod KeepForever()
     String ToString()
   }
+  class RetentionPeriodStrategy
+    IComparable
+    Octopus.TinyTypes.CaseInsensitiveStringTinyType
+  {
+    static Octopus.Client.Model.RetentionPeriodStrategy Count
+    static Octopus.Client.Model.RetentionPeriodStrategy Default
+    static Octopus.Client.Model.RetentionPeriodStrategy Forever
+    .ctor(String)
+  }
   class RetentionPoliciesConfigurationResource
     Octopus.Client.Extensibility.IResource
     Octopus.Client.Model.IAuditedResource

source/Octopus.Server.Client/Model/RetentionPeriod.cs

@@ -26,6 +26,7 @@ public RetentionPeriod(int quantityToKeep, RetentionUnit unit) : this(null, quan
         public bool ShouldKeepForever => QuantityToKeep == 0;
 
         public static RetentionPeriod Default() => new(RetentionPeriodStrategy.Default, 0, RetentionUnit.Items);
+        public static RetentionPeriod KeepForever() => new(RetentionPeriodStrategy.Forever, 0, RetentionUnit.Items);
 
         RetentionPeriodStrategy SelectStrategyBasedOnSettings(int quantityToKeep, RetentionUnit unit)
         {
@@ -72,5 +73,6 @@ public class RetentionPeriodStrategy(string value) : CaseInsensitiveStringTinyTy
     {
         public static readonly RetentionPeriodStrategy Default = new("Default");
         public static readonly RetentionPeriodStrategy Count = new("Count");
+        public static readonly RetentionPeriodStrategy Forever = new("Forever");
     }
 }