fix: custom project name keeping fixed docker-compose file

docker-compose.yml

@@ -1,4 +1,4 @@
-name: wordpress
+name: ${WPSTACK_PROJECT_NAME:-wpstack}
 
 services:
 

sample.env

@@ -2,6 +2,7 @@ DB_HOST=db
 DB_USER=wordpress
 DB_NAME=wordpress
 DB_PASS=mysecretpassword
+WPSTACK_PROJECT_NAME=wpstack-example # rename your project
 WPSTACK_ADMIN_EMAIL=contato@example.com # use a valid email
 WPSTACK_PROTOCOL=https
 WPSTACK_DOMAIN=localhost