Fix Makefile formatting

Makefile

@@ -9,9 +9,9 @@ compile-quick: clean compile-java-quick;
 install-npm:;
 	npm ci
 generate-spec: install-npm;
-  npm run generate-json-schema
+	npm run generate-json-schema
 validate-spec: install-npm;
-  npm run test
+	npm run test
 compile-start: compile-quick;
 	docker-compose down
 	docker-compose build