tests: Add `refs` folder to the `bad_tag.git` repo
diff --git a/tests/resources/bad_tag.git/refs/dummy-marker.txt b/tests/resources/bad_tag.git/refs/dummy-marker.txt
new file mode 100644
index 0000000..e69de29
--- /dev/null
+++ b/tests/resources/bad_tag.git/refs/dummy-marker.txt