feat: install atlas in edx_django_service

Download the openedx-atlas executable for all edx_django_service to be used in `make pull_translations`

This installs `atlas` on all Ansible build targets such as Native Installation and Devstack.

This contribution is part of the [FC-0012 project](https://openedx.atlassian.net/l/cp/XGS0iCcQ) which is sparked by the [Translation Infrastructure update OEP-58](https://open-edx-proposals.readthedocs.io/en/latest/architectural-decisions/oep-0058-arch-translations-management.html#specification).

playbooks/roles/edx_django_service/tasks/main.yml

@@ -212,6 +212,16 @@
     - install
     - install:app-requirements
 
+- name: install Open edX Atlas translation tool
+  get_url:
+    url: "https://github.com/openedx/openedx-atlas/releases/download/v0.1.1/atlas"
+    # Even though Atlas is a bash script, it is installed in the virtualenv to avoid adding another PATH entry.
+    dest: "{{ edx_django_service_venv_dir }}/bin/atlas"
+  become_user: "{{ edx_django_service_user }}"
+  tags:
+    - install
+    - install:app-requirements
+
 - name: Check for existing make_migrate container
   command: "docker ps -aq --filter name='{{ edx_django_service_name }}.make_migrate'"
   register: edx_django_service_make_migrate_container