fix: add version command and arg

Sources/Container-Compose/Application.swift

@@ -10,11 +10,18 @@ import ArgumentParser
 
 @main
 struct Main: AsyncParsableCommand {
+    private static let commandName: String = "container-compose"
+    private static let version: String = "v0.5.1"
+    static var versionString: String {
+        "\(commandName) version \(version)"
+    }
     static let configuration: CommandConfiguration = .init(
-        commandName: "container-compose",
+        commandName: Self.commandName,
         abstract: "A tool to use manage Docker Compose files with Apple Container",
+        version: Self.versionString,
         subcommands: [
             ComposeUp.self,
-            ComposeDown.self
+            ComposeDown.self,
+            Version.self
         ])
 }

Sources/Container-Compose/Commands/Version.swift

@@ -0,0 +1,37 @@
+//===----------------------------------------------------------------------===//
+// Copyright © 2025 Apple Inc. and the container project authors. All rights reserved.
+//
+// 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.
+//===----------------------------------------------------------------------===//
+
+//
+//  Version.swift
+//  Container-Compose
+//
+//  Created by Container Compose Contributors
+//
+
+import ArgumentParser
+import Foundation
+
+struct Version: ParsableCommand {
+
+    static let configuration: CommandConfiguration = .init(
+        commandName: "version",
+        abstract: "Display the version information"
+    )
+
+    func run() {
+        print("\(Main.versionString)")
+    }
+}