Fix for SecretAgent acting as if it has no keys after updating macOS (#427)

* Allow reload pre-op

* Fix tests

* Make sure standin keys get rewritten on force update

* Stub store

Sources/Packages/Sources/SecretKit/Erasers/AnySecretStore.swift

@@ -12,6 +12,7 @@ public class AnySecretStore: SecretStore {
     private let _sign: (Data, AnySecret, SigningRequestProvenance) throws -> Data
     private let _existingPersistedAuthenticationContext: (AnySecret) -> PersistedAuthenticationContext?
     private let _persistAuthentication: (AnySecret, TimeInterval) throws -> Void
+    private let _reloadSecrets: () -> Void
 
     private var sink: AnyCancellable?
 
@@ -24,6 +25,7 @@ public class AnySecretStore: SecretStore {
         _sign = { try secretStore.sign(data: $0, with: $1.base as! SecretStoreType.SecretType, for: $2) }
         _existingPersistedAuthenticationContext = { secretStore.existingPersistedAuthenticationContext(secret: $0.base as! SecretStoreType.SecretType) }
         _persistAuthentication = { try secretStore.persistAuthentication(secret: $0.base as! SecretStoreType.SecretType, forDuration: $1) }
+        _reloadSecrets = { secretStore.reloadSecrets() }
         sink = secretStore.objectWillChange.sink { _ in
             self.objectWillChange.send()
         }
@@ -57,6 +59,10 @@ public class AnySecretStore: SecretStore {
         try _persistAuthentication(secret, duration)
     }
 
+    public func reloadSecrets() {
+        _reloadSecrets()
+    }
+
 }
 
 public class AnySecretStoreModifiable: AnySecretStore, SecretStoreModifiable {

Sources/Packages/Sources/SecretKit/Types/SecretStore.swift

@@ -36,6 +36,9 @@ public protocol SecretStore: ObservableObject, Identifiable {
     ///  - Note: This is used for temporarily unlocking access to a secret which would otherwise require authentication every single use. This is useful for situations where the user anticipates several rapid accesses to a authorization-guarded secret.
     func persistAuthentication(secret: SecretType, forDuration duration: TimeInterval) throws
 
+    /// Requests that the store reload secrets from any backing store, if neccessary.
+    func reloadSecrets()
+
 }
 
 /// A SecretStore that the Secretive admin app can modify.