Open release file in retry loop (#110)

pkg/github/github.go

@@ -153,17 +153,17 @@ func (c *Client) uploadReleaseAsset(ctx context.Context, releaseID int64, filena
 		return errors.Wrap(err, "failed to get abs path")
 	}
 
-	f, err := os.Open(filename)
-	if err != nil {
-		return errors.Wrap(err, "failed to open file")
-	}
-
 	opts := &github.UploadOptions{
 		// Use base name by default
 		Name: filepath.Base(filename),
 	}
 
 	if err := retry.Retry(3, 3*time.Second, func() error {
+		f, err := os.Open(filename)
+		if err != nil {
+			return errors.Wrap(err, "failed to open file")
+		}
+		defer f.Close()
 		if _, _, err = c.Repositories.UploadReleaseAsset(context.TODO(), c.owner, c.repo, releaseID, opts, f); err != nil {
 			return errors.Wrapf(err, "failed to upload release asset: %s\n", filename)
 		}