[config] Add contents of fuchsia/infra/roller-tests/test-package3

This will make the roll a no-op which should cause the
uptodate-cipd-to-git-roller to test the no-op codepath, as intended.

Bug: 98487
Change-Id: Ib31f858a3adabb4569d42ab99325188517231d7c
Reviewed-on: https://fuchsia-review.googlesource.com/c/infra/roller-tests/integration/+/673773
Reviewed-by: Oliver Newman <olivernewman@google.com>
Commit-Queue: Anthony Fandrianto <atyfto@google.com>
diff --git a/prebuilt/3/bar.txt b/prebuilt/3/bar.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/prebuilt/3/bar.txt