fix(ci): docker rm requires at least 1 argument (#518)

* fix(ci): docker rm requires at least 1 argument

* fix: replace $$ with $()

Author: skl

Makefile

@@ -249,9 +249,9 @@ cleanup-integration-test: $(KIND)
 	$(KIND) delete cluster -n test-kind-cluster || true
 	@echo "### Removing docker containers and images"
 	$(eval CONTAINERS := $(shell $(OCI_BIN) ps --format '{{.Names}}' | grep 'integration-'))
-	$(if $(strip $(CONTAINERS)),$(OCI_BIN) rm -f $$CONTAINERS,@echo "No integration test containers to remove")
+	$(if $(strip $(CONTAINERS)),$(OCI_BIN) rm -f $(CONTAINERS),@echo "No integration test containers to remove")
 	$(eval IMAGES := $(shell $(OCI_BIN) images --format '{{.Repository}}:{{.Tag}}' | grep 'hatest-'))
-	$(if $(strip $(CONTAINERS)),$(OCI_BIN) rmi -f $$IMAGES,@echo "No integration test images to remove")
+	$(if $(strip $(IMAGES)),$(OCI_BIN) rmi -f $(IMAGES),@echo "No integration test images to remove")
 
 .PHONY: run-integration-test
 run-integration-test: