artifact: use {pkg_root_path} template in rust and go_win extract

Switch the rust and go_win downloaders from baking PKG_ROOT_PATH into
the extract path at download time to the {pkg_root_path} template,
which ArtifactExtractor resolves at extract time. This keeps the path
stable across runs where pkg_root_path differs between download and
extract (e.g. containerised vs host builds).

Author: henderkes

src/Package/Artifact/go_win.php

@@ -20,8 +20,6 @@ class go_win
     ])]
     public function downBinary(ArtifactDownloader $downloader): DownloadResult
     {
-        $pkgroot = PKG_ROOT_PATH;
-
         // get version
         [$version] = explode("\n", default_shell()->executeCurl('https://go.dev/VERSION?m=text', retries: $downloader->getRetry()) ?: '');
         if ($version === '') {
@@ -52,7 +50,7 @@ public function downBinary(ArtifactDownloader $downloader): DownloadResult
             throw new DownloaderException("Hash mismatch for downloaded go-win binary. Expected {$hash}, got {$file_hash}");
         }
 
-        return DownloadResult::archive(basename($path), ['url' => $url, 'version' => $version], extract: "{$pkgroot}/go-win", verified: true, version: $version);
+        return DownloadResult::archive(basename($path), ['url' => $url, 'version' => $version], extract: '{pkg_root_path}/go-win', verified: true, version: $version);
     }
 
     #[CustomBinaryCheckUpdate('go-win', ['windows-x86_64'])]

src/Package/Artifact/rust.php

@@ -46,7 +46,7 @@ public function downBinary(ArtifactDownloader $downloader): DownloadResult
         $download_url = "https://static.rust-lang.org/dist/rust-{$latest_version}-{$arch}-unknown-linux-{$distro}.tar.xz";
         $path = DOWNLOAD_PATH . DIRECTORY_SEPARATOR . basename($download_url);
         default_shell()->executeCurlDownload($download_url, $path, retries: $downloader->getRetry());
-        return DownloadResult::archive(basename($path), ['url' => $download_url, 'version' => $latest_version], extract: PKG_ROOT_PATH . '/rust-install', verified: false, version: $latest_version);
+        return DownloadResult::archive(basename($path), ['url' => $download_url, 'version' => $latest_version], extract: '{pkg_root_path}/rust-install', verified: false, version: $latest_version);
     }
 
     #[CustomBinaryCheckUpdate('rust', [