chore: import upstream snapshot with attribution

Sources/cctl/cctl+Utils.swift

@@ -0,0 +1,53 @@
+//===----------------------------------------------------------------------===//
+// 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 Containerization
+import ContainerizationError
+import ContainerizationOCI
+import Foundation
+
+extension Application {
+    static func fetchImage(reference: String, store: ImageStore) async throws -> Containerization.Image {
+        do {
+            return try await store.get(reference: reference)
+        } catch let error as ContainerizationError {
+            if error.code == .notFound {
+                return try await store.pull(reference: reference)
+            }
+            throw error
+        }
+    }
+
+    static func parseKeyValuePairs(from items: [String]) -> [String: String] {
+        var parsedLabels: [String: String] = [:]
+        for item in items {
+            let parts = item.split(separator: "=", maxSplits: 1)
+            guard parts.count == 2 else {
+                continue
+            }
+            let key = String(parts[0])
+            let val = String(parts[1])
+            parsedLabels[key] = val
+        }
+        return parsedLabels
+    }
+}
+
+extension ContainerizationOCI.Platform {
+    static var arm64: ContainerizationOCI.Platform {
+        .init(arch: "arm64", os: "linux", variant: "v8")
+    }
+}