chore: import upstream snapshot with attribution

Tests/ContainerizationTests/ImageTests/ContainsAuth.swift

@@ -0,0 +1,38 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025-2026 Apple Inc. and the Containerization project authors.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//   https://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+//===----------------------------------------------------------------------===//
+
+import ContainerizationOCI
+import Foundation
+
+internal protocol ContainsAuth {
+
+}
+
+extension ContainsAuth {
+    static var hasRegistryCredentials: Bool {
+        authentication != nil
+    }
+
+    static var authentication: Authentication? {
+        let env = ProcessInfo.processInfo.environment
+        guard let password = env["REGISTRY_TOKEN"],
+            let username = env["REGISTRY_USERNAME"]
+        else {
+            return nil
+        }
+        return BasicAuthentication(username: username, password: password)
+    }
+}