feature: Allow installing extra requirements when using the credentials role

CHANGELOG.md

@@ -1,6 +1,10 @@
 # Changelog
 All notable changes to this project will be documented in this file.
-Add any new changes to the top(right below this line).
+Add any new changes to the top (right below this line).
+
+ - 2021-06-17
+    - Role credentials
+       - Installs extra python packages specified in `CREDENTIALS_EXTRA_REQUIREMENTS` (defaults to `[]`).
 
  - 2021-07-03
     - Role: ecommerce

playbooks/roles/credentials/defaults/main.yml

@@ -108,6 +108,8 @@ CREDENTIALS_GUNICORN_EXTRA: ''
 
 CREDENTIALS_EXTRA_APPS: []
 
+CREDENTIALS_EXTRA_REQUIREMENTS: []
+
 CREDENTIALS_SESSION_EXPIRE_AT_BROWSER_CLOSE: false
 
 CREDENTIALS_CERTIFICATE_LANGUAGES:

playbooks/roles/credentials/meta/main.yml

@@ -40,6 +40,7 @@ dependencies:
     edx_django_service_backend_service_edx_oauth2_secret: '{{ CREDENTIALS_BACKEND_SERVICE_EDX_OAUTH2_SECRET }}'
     edx_django_service_social_auth_redirect_is_https: '{{ CREDENTIALS_SOCIAL_AUTH_REDIRECT_IS_HTTPS }}'
     edx_django_service_extra_apps: '{{ CREDENTIALS_EXTRA_APPS }}'
+    edx_django_service_extra_requirements: '{{ CREDENTIALS_EXTRA_REQUIREMENTS }}'
     edx_django_service_session_expire_at_browser_close: '{{ CREDENTIALS_SESSION_EXPIRE_AT_BROWSER_CLOSE }}'
     edx_django_service_node_version: '{{ CREDENTIALS_NODE_VERSION }}'
     edx_django_service_automated_users: '{{ CREDENTIALS_AUTOMATED_USERS }}'