Ansible playbook with environment variable [duplicate]

Question

I trying to setup a gitlab pipeline to create a rabbitmq standalone machine, and i use rockandska/ansible-role-rabbitmq to do this. But in defaults/main.yaml e need to create some users with password, but i dont want to commit passwords in my git repo. So i need to get pass values from gitlab ci/cd environments variables.

But i'm not getting this, i trying to create a file in

vars/main.yml

---

rabbitmq_admin_pass: ${RABBITMQ_PASSWORD}

and in defaults/main.yml i use

rabbitmq_users_to_create:
  - user: admin
    password: "{{ rabbitmq_admin_pass }}"
    vhost: /
    configure_priv: .*
    read_priv: .*
    write_priv: .*
    tags: administrator

but doesn't work, it creates the user but with "${RABBITMQ_PASSWORD}" pass :D

ps. I already put in .gitlab-ci.yml variables directive, like that:

variables:
  ANSIBLE_BECOME_PASSWORD: ${ANSIBLE_BECOME_PASSWORD}
  RABBITMQ_PASSWORD: ${RABBITMQ_PASSWORD}

someone have some idea to do this?

Thanks!