Examples: Adopt structure used in Vapor template

Author: euanh

Examples/HelloWorldVapor/Sources/configure.swift

@@ -0,0 +1,19 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftContainerPlugin open source project
+//
+// Copyright (c) 2025 Apple Inc. and the SwiftContainerPlugin project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftContainerPlugin project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+import Vapor
+
+public func configure(_ app: Application) async throws {
+    try routes(app)
+}

Examples/HelloWorldVapor/Sources/entrypoint.swift

@@ -0,0 +1,33 @@
+//===----------------------------------------------------------------------===//
+//
+// This source file is part of the SwiftContainerPlugin open source project
+//
+// Copyright (c) 2025 Apple Inc. and the SwiftContainerPlugin project authors
+// Licensed under Apache License v2.0
+//
+// See LICENSE.txt for license information
+// See CONTRIBUTORS.txt for the list of SwiftContainerPlugin project authors
+//
+// SPDX-License-Identifier: Apache-2.0
+//
+//===----------------------------------------------------------------------===//
+
+import Vapor
+
+@main
+enum Entrypoint {
+    static func main() async throws {
+        let env = try Environment.detect()
+        let app = try await Application.make(env)
+
+        do {
+            try await configure(app)
+            try await app.execute()
+        } catch {
+            app.logger.report(error: error)
+            try? await app.asyncShutdown()
+            throw error
+        }
+        try await app.asyncShutdown()
+    }
+}

Examples/HelloWorldVapor/Sources/main.swift renamed to Examples/HelloWorldVapor/Sources/routes.swift

@@ -2,7 +2,7 @@
 //
 // This source file is part of the SwiftContainerPlugin open source project
 //
-// Copyright (c) 2024 Apple Inc. and the SwiftContainerPlugin project authors
+// Copyright (c) 2025 Apple Inc. and the SwiftContainerPlugin project authors
 // Licensed under Apache License v2.0
 //
 // See LICENSE.txt for license information
@@ -17,10 +17,9 @@ import Vapor
 
 let myos = ProcessInfo.processInfo.operatingSystemVersionString
 
-let app = try Application(.detect())
-app.http.server.configuration.hostname = "0.0.0.0"
-defer { app.shutdown() }
+func routes(_ app: Application) throws {
 
-app.get { _ in "Hello World, from Vapor on \(myos)\n" }
-
-try app.run()
+    app.get { req async in
+        "Hello World, from Vapor on \(myos)\n"
+    }
+}