ci: fix the broken VERSION env
diff --git a/Makefile b/Makefile
index 22e647c..6bf1e52 100644
--- a/Makefile
+++ b/Makefile
@@ -371,7 +371,7 @@
 	./apisix \
 	./bin \
 	./conf \
-	./rockspec/apisix-$(project_version)*.rockspec \
+	./rockspec/apisix-$(VERSION)*.rockspec \
 	./rockspec/apisix-master-0.rockspec \
 	LICENSE \
 	Makefile \