Remove dist before building

Makefile

@@ -23,6 +23,7 @@ clean:
 	find . -name '*.pyc' -exec rm {} \;
 
 build:
+	rm -f dist/arkindex-*.tar.gz
 	python setup.py sdist
 	docker build --no-cache $(ROOT_DIR) -t $(TAG_APP):$(VERSION) -t $(TAG_APP):latest --build-arg PONOS_BRANCH=$(PONOS_BRANCH) --build-arg COMMON_BRANCH=$(COMMON_BRANCH)