During "make dump" command, execute "composer install" only if the ve…

…ndor dir is missing

Makefile

@@ -67,12 +67,12 @@ db-import: up ## Execute a SQL file. Pass the parameter "filename=" to set the f
 	$(eval filename ?= dump.sql)
 	$(DOCKER_COMPOSE) exec -T db sh -c 'mysql --password=$$MYSQL_ROOT_PASSWORD' < $(filename)
 
-vendor: composer.json
+vendor: | composer.json
 	$(PHP_CLI) composer install
 
 .env: | .env.dist
 	@cp .env.dist .env
 ifeq ($(UNAME), Linux)
 	@sed -i -e "s/^UID=.*/UID=$$(id -u)/" -e "s/^GID=.*/GID=$$(id -g)/" .env
 endif
-	@echo ".env file was automatically created."
+	@echo ".env file was automatically created."