Send CoreData saving errors to Sentry

Tusker/CoreData/MastodonCachePersistentStore.swift

@@ -11,6 +11,7 @@ import CoreData
 import Pachyderm
 import Combine
 import OSLog
+import Sentry
 
 fileprivate let logger = Logger(subsystem: Bundle.main.bundleIdentifier!, category: "PersistentStore")
 
@@ -73,6 +74,9 @@ class MastodonCachePersistentStore: NSPersistentContainer {
             try context.save()
         } catch {
             logger.error("Unable to save managed object context: \(String(describing: error), privacy: .public)")
+            let crumb = Breadcrumb(level: .fatal, category: "PersistentStore")
+            crumb.message = String(describing: error)
+            SentrySDK.addBreadcrumb(crumb: crumb)
             fatalError("Unable to save managed object context")
         }
     }