Specify apksig test size = "small"
am: 168eeb5423

Change-Id: Iddb946c9fbeb5af14639abe79641874688d1b9bd
diff --git a/BUILD b/BUILD
index 4814ee7..7e39c8e 100644
--- a/BUILD
+++ b/BUILD
@@ -42,6 +42,7 @@
     resources = glob([
         "src/test/resources/**/*",
     ]),
+    size = "small",
     test_class = "com.android.apksig.AllTests",
     deps = [":apksig-all"],
 )