Build: .NET Core builds fail to copy some dependencies into appropriate release folder

[Aaronontheweb]

Within the past couple of days, all of the Akka.Persistence.Sqlite specs on .NET Core on Windows have been failing with the following error:

[RunTestsNetCore] [INFO][10/12/2017 4:13:41 AM][Thread 0009][akka://SqliteSnapshotStoreSpec/system/akka.persistence.snapshot-store.sqlite] Message SaveSnapshot from akka://SqliteSnapshotStoreSpec/system/testActor11 to akka://SqliteSnapshotStoreSpec/system/akka.persistence.snapshot-store.sqlite was not delivered. 1 dead letters encountered.
[04:13:44]    [Akka.Persistence.Sqlite.Tests.SqliteSnapshotStoreSpec.SnapshotStore_should_not_load_a_snapshot_given_non_matching_timestamp_criteria] Failed: Timeout 00:00:03 while waiting for a message of type Akka.Persistence.SaveSnapshotSuccess 
Expected: True
Actual:   False
   at Akka.TestKit.Xunit2.XunitAssertions.Fail(String format, Object[] args) in D:\work\edbce350daf6a08d\src\contrib\testkits\Akka.TestKit.Xunit2\XunitAssertions.cs:line 27
   at Akka.TestKit.TestKitBase.InternalExpectMsgEnvelope[T](Nullable`1 timeout, Action`2 assert, String hint, Boolean shouldLog) in D:\work\edbce350daf6a08d\src\core\Akka.TestKit\TestKitBase_Expect.cs:line 241
   at Akka.TestKit.TestKitBase.InternalExpectMsgEnvelope[T](Nullable`1 timeout, Action`1 msgAssert, Action`1 senderAssert, String hint) in D:\work\edbce350daf6a08d\src\core\Akka.TestKit\TestKitBase_Expect.cs:line 224
   at Akka.Persistence.TCK.Snapshot.SnapshotStoreSpec.<WriteSnapshots>d__13.MoveNext() in D:\work\edbce350daf6a08d\src\core\Akka.Persistence.TCK\Snapshot\SnapshotStoreSpec.cs:line 80
   at System.Collections.Generic.List`1..ctor(IEnumerable`1 collection)
   at System.Linq.Enumerable.ToList[TSource](IEnumerable`1 source)
   at Akka.Persistence.TCK.Snapshot.SnapshotStoreSpec.Initialize() in D:\work\edbce350daf6a08d\src\core\Akka.Persistence.TCK\Snapshot\SnapshotStoreSpec.cs:line 66

In essence, the Sqlite3.dll cannot be found. This issue does not occur for the build under .NET 4.5.2.

Ditto with the .NET Core multi-node specs on Windows: can't find the Hyperion DLL either:

[WARNING][10/12/2017 4:16:23 AM][Thread 0001][ActorSystem(NoteTestRunner-0)] NewtonSoftJsonSerializer has been detected as a default serializer. It will be obsoleted in Akka.NET starting from version 1.5 in the favor of Hyperion (for more info visit: http://getakka.net/docs/Serialization#how-to-setup-hyperion-as-default-serializer ). If you want to suppress this message set HOCON `akka.suppress-json-serializer-warning` config flag to on.
Running specs for Akka.Cluster.Sharding.Tests.MultiNode.dll [D:\work\edbce350daf6a08d\src\contrib\cluster\Akka.Cluster.Sharding.Tests.MultiNode\bin\Release\netcoreapp1.1\Akka.Cluster.Sharding.Tests.MultiNode.dll]

[Node1:controller][FAIL] Akka.Cluster.Sharding.Tests.ClusterShardingGetStateSpec.Inspecting_cluster_sharding_state_specs
[Node1:controller][FAIL-EXCEPTION] Type: System.IO.FileNotFoundException
--> [Node1:controller][FAIL-EXCEPTION] Message: Could not load file or assembly 'Hyperion, Version=0.9.6.0, Culture=neutral, PublicKeyToken=null'. The system cannot find the file specified.
--> [Node1:controller][FAIL-EXCEPTION] StackTrace:    at Akka.Serialization.HyperionSerializer..ctor(ExtendedActorSystem system, HyperionSerializerSettings settings)

[ERROR][10/12/2017 4:16:33 AM][Thread 0006][akka://NoteTestRunner-0/system/IO-TCP/$a] Monitored actor [[akka://NoteTestRunner-0/user/$a#1941232185]] terminated
Cause: Akka.Actor.DeathPactException: Monitored actor [[akka://NoteTestRunner-0/user/$a#1941232185]] terminated
   at Akka.Actor.ActorBase.Unhandled(Object message) in D:\work\edbce350daf6a08d\src\core\Akka\Actor\ActorBase.cs:line 193
   at Akka.Actor.ActorBase.AroundReceive(Receive receive, Object message) in D:\work\edbce350daf6a08d\src\core\Akka\Actor\ActorBase.cs:line 158
   at Akka.Actor.ActorCell.ReceiveMessage(Object message) in D:\work\edbce350daf6a08d\src\core\Akka\Actor\ActorCell.DefaultMessages.cs:line 179
   at Akka.Actor.ActorCell.AutoReceiveMessage(Envelope envelope) in D:\work\edbce350daf6a08d\src\core\Akka\Actor\ActorCell.DefaultMessages.cs:line 145
   at Akka.Actor.ActorCell.Invoke(Envelope envelope) in D:\work\edbce350daf6a08d\src\core\Akka\Actor\ActorCell.DefaultMessages.cs:line 77

As it turns out, there is a straightforward explanation for this... These DLLs aren't being copied out to the netcore1.1 output folder in either of these cases:

.NET 4.5.2 output folder

.NETCoreApp1.1 output folder

We've not changed anything in our build system or environment that would cause this in our most recent PRs, insofar as I'm aware. Must be something that updated in the background as part of our automated scripts. Will be looking into this.