removed prune command from makefile

Author: zvfvrv

calico-vpp-agent/Makefile

@@ -26,7 +26,6 @@ image: build gobgp
 	@if [ "${ALSO_LATEST}" = "y" ]; then \
 		docker tag calicovpp/agent:$(TAG) calicovpp/agent:latest; \
 	fi
-	docker image prune -f
 
 push: image
 	docker push calicovpp/agent:$(TAG)
@@ -41,4 +40,4 @@ dev: build gobgp
 	docker build -t calicovpp/agent:$(TAG) .
 
 proto:
-	$(MAKE) -C proto $@
+	$(MAKE) -C proto $@