chore: simplify dlcache initialization

internal/build/source_downloader.go

@@ -74,7 +74,7 @@ func (s *SourceDownloader) DownloadSources(
 			}
 		}
 
-		opts.DlCache = dlcache.New(s.cfg)
+		opts.DlCache = dlcache.New(s.cfg.GetPaths().CacheDir)
 
 		err := dl.Download(ctx, opts)
 		if err != nil {

pkg/dl/dl_test.go

@@ -155,7 +155,7 @@ func TestDownloadFileWithCache(t *testing.T) {
 				CacheDisabled: false,
 				URL:           server.URL + "/file",
 				Destination:   tmpdir,
-				DlCache:       dlcache.New(cfg),
+				DlCache:       dlcache.New(cfg.GetPaths().CacheDir),
 			}
 
 			outputFile := path.Join(tmpdir, "file")

pkg/dlcache/dlcache.go

@@ -32,19 +32,15 @@ type Config interface {
 }
 
 type DownloadCache struct {
-	cfg Config
+	cacheDir string
 }
 
-func New(cfg Config) *DownloadCache {
-	return &DownloadCache{
-		cfg,
-	}
+func New(cacheDir string) *DownloadCache {
+	return &DownloadCache{cacheDir}
 }
 
 func (dc *DownloadCache) BasePath(ctx context.Context) string {
-	return filepath.Join(
-		dc.cfg.GetPaths().CacheDir, "dl",
-	)
+	return filepath.Join(dc.cacheDir, "dl")
 }
 
 // New creates a new directory with the given ID in the cache.

pkg/dlcache/dlcache_test.go

@@ -64,7 +64,7 @@ func TestNew(t *testing.T) {
 	cfg := prepare(t)
 	defer cleanup(t, cfg)
 
-	dc := dlcache.New(cfg)
+	dc := dlcache.New(cfg.GetPaths().CacheDir)
 
 	ctx := context.Background()