wip split build tool for example app

.github/workflows/check.yaml

@@ -75,4 +75,27 @@ jobs:
           xcode-version: ${{ matrix.tooling.xcode-version }}
 
       - name: Build and run tests
-        run: swift run BuildTool --platform ${{ matrix.platform }} --swift-version ${{ matrix.tooling.swift-version }}
+        run: swift run BuildTool build-and-test-library --platform ${{ matrix.platform }} --swift-version ${{ matrix.tooling.swift-version }}
+
+  check-example-app:
+    name: Example app, ${{matrix.platform}} (Xcode ${{ matrix.tooling.xcode-version }}, Swift ${{ matrix.tooling.swift-version }})
+    runs-on: macos-latest
+
+    strategy:
+      fail-fast: false
+      matrix:
+        tooling:
+          - xcode-version: 15.3
+            swift-version: 5
+          - xcode-version: 16-beta
+            swift-version: 6
+        platform: [macOS, iOS, tvOS]
+
+    steps:
+      - uses: actions/checkout@v4
+      - uses: maxim-lobanov/setup-xcode@v1
+        with:
+          xcode-version: ${{ matrix.tooling.xcode-version }}
+
+      - name: Build example app
+        run: swift run BuildTool build-example-app --platform ${{ matrix.platform }} --swift-version ${{ matrix.tooling.swift-version }}

Sources/BuildTool/BuildTool.swift

@@ -64,12 +64,17 @@ enum Error: Swift.Error {
     case simulatorLookupFailed(message: String)
 }
 
+@main
 // TODO: Is there a better way to make sure that this script has access to macOS APIs that are more recent than the package’s deployment target?
 @available(macOS 14, *)
-@main
 struct BuildTool: ParsableCommand {
-    @Option var platform: Platform
+    static let configuration = CommandConfiguration(subcommands: [BuildAndTestLibrary.self])
+}
 
+// TODO: Is there a better way to make sure that this script has access to macOS APIs that are more recent than the package’s deployment target?
+@available(macOS 14, *)
+struct BuildAndTestLibrary: ParsableCommand {
+    @Option var platform: Platform
     @Option var swiftVersion: Int
 
     mutating func run() throws {