fix: harden desktop release OSS uploads

server/internal/shared/objectstorage/client.go

@@ -33,6 +33,10 @@ type ReaderClient interface {
 	PutReader(ctx context.Context, objectKey string, reader io.Reader, size int64, contentType string) error
 }
 
+type ObjectReaderClient interface {
+	GetReader(ctx context.Context, objectKey string) (io.ReadCloser, error)
+}
+
 type PresignedPutResult struct {
 	URL       string
 	Headers   http.Header