plugin, containertool: Remove unnecessarily broad Foundation imports

Author: euanh

Plugins/ContainerImageBuilder/Pipe+lines.swift

@@ -12,7 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
+import class Foundation.Pipe
 
 extension Pipe {
     var lines: AsyncThrowingStream<String, Error> {

Sources/Tar/tar.swift

@@ -12,7 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
+import struct Foundation.Data
 
 // This file defines a basic tar writer which produces POSIX tar files.
 // This avoids the need to depend on a system-provided tar binary.

Sources/containertool/Extensions/RegistryClient+Layers.swift

@@ -12,7 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
+import struct Foundation.Data
 import ContainerRegistry
 
 extension RegistryClient {

Tests/ContainerRegistryTests/SmokeTests.swift

@@ -12,7 +12,7 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
+import class Foundation.ProcessInfo
 import ContainerRegistry
 import Testing
 

Tests/TarTests/TarUnitTests.swift

@@ -12,7 +12,6 @@
 //
 //===----------------------------------------------------------------------===//
 
-import Foundation
 import Testing
 
 @testable import Tar

Tests/containertoolTests/ZlibTests.swift

@@ -14,7 +14,6 @@
 
 @testable import containertool
 import Crypto
-import Foundation
 import Testing
 
 // Check that compressing the same data on macOS and Linux produces the same output.