Fix: Support x86_64 architecture alias to prevent silent pull failure… (#1036)

- Adds architecture name normalization to accept
  `x86_64` and `x86-64` as aliases for `amd64`.

Sources/Services/ContainerAPIService/Client/Arch.swift

@@ -17,6 +17,17 @@
 public enum Arch: String {
     case arm64, amd64
 
+    public init?(rawValue: String) {
+        switch rawValue.lowercased() {
+        case "arm64":
+            self = .arm64
+        case "amd64", "x86_64", "x86-64":
+            self = .amd64
+        default:
+            return nil
+        }
+    }
+
     public static func hostArchitecture() -> Arch {
         #if arch(arm64)
         return .arm64

Tests/ContainerAPIClientTests/ArchTests.swift

@@ -0,0 +1,65 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2026 Apple Inc. and the container 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 Testing
+
+@testable import ContainerAPIClient
+
+struct ArchTests {
+
+    @Test func testAmd64Initialization() throws {
+        let arch = Arch(rawValue: "amd64")
+        #expect(arch != nil)
+        #expect(arch == .amd64)
+    }
+
+    @Test func testX86_64Alias() throws {
+        let arch = Arch(rawValue: "x86_64")
+        #expect(arch != nil)
+        #expect(arch == .amd64)
+    }
+
+    @Test func testX86_64WithDashAlias() throws {
+        let arch = Arch(rawValue: "x86-64")
+        #expect(arch != nil)
+        #expect(arch == .amd64)
+    }
+
+    @Test func testArm64Initialization() throws {
+        let arch = Arch(rawValue: "arm64")
+        #expect(arch != nil)
+        #expect(arch == .arm64)
+    }
+
+    @Test func testCaseInsensitive() throws {
+        #expect(Arch(rawValue: "AMD64") == .amd64)
+        #expect(Arch(rawValue: "X86_64") == .amd64)
+        #expect(Arch(rawValue: "ARM64") == .arm64)
+        #expect(Arch(rawValue: "Amd64") == .amd64)
+    }
+
+    @Test func testInvalidArchitecture() throws {
+        #expect(Arch(rawValue: "invalid") == nil)
+        #expect(Arch(rawValue: "i386") == nil)
+        #expect(Arch(rawValue: "powerpc") == nil)
+        #expect(Arch(rawValue: "") == nil)
+    }
+
+    @Test func testRawValueRoundTrip() throws {
+        #expect(Arch.amd64.rawValue == "amd64")
+        #expect(Arch.arm64.rawValue == "arm64")
+    }
+}