fix: filename is already full path

cache/cache.go

@@ -82,5 +82,5 @@ func DownloadDebianCache(cachePath string) (err error) {
 		return
 	}
 
-	return os.Rename(filepath.Join(tmp, resp.Filename), cachePath)
+	return os.Rename(resp.Filename, cachePath)
 }

cache/cache_test.go

@@ -29,7 +29,7 @@ func TestDownloadQemuImage(t *testing.T) {
 }
 
 func TestDownloadDebianCache(t *testing.T) {
-	tmp, err := ioutil.TempDir("", "out-of-tree_")
+	tmp, err := fs.TempDir()
 	if err != nil {
 		return
 	}