Rescue graph building test into subcommand

Sources/apk/Index/ApkIndexUpdate.swift

@@ -1,33 +0,0 @@
-/*
- * darwin-apk © 2024 Gay Pizza Specifications
- * SPDX-License-Identifier: Apache-2.0
- */
-
-import Foundation
-
-public struct ApkIndexUpdater {
-  public var repositories: [ApkIndexRepository]
-
-  public init() {
-    self.repositories = []
-  }
-
-  public func buildGraph() async {
-    let graph: ApkPackageGraph
-    do {
-      graph = ApkPackageGraph(index: try await ApkIndexReader.resolve(self.repositories, fetch: .lazy))
-      graph.buildGraphNode()
-
-      try graph.pkgIndex.description.write(to: URL(filePath: "packages.txt"), atomically: false, encoding: .utf8)
-    } catch {
-      fatalError(error.localizedDescription)
-    }
-
-    if var out = TextFileWriter(URL(filePath: "shallowIsolates.txt")) {
-      for node in graph.shallowIsolates { print(node, to: &out) }
-    }
-    if var out = TextFileWriter(URL(filePath: "deepIsolates.txt")) {
-      for node in graph.deepIsolates { print(node, to: &out) }
-    }
-  }
-}