Update credentials playbook

CHANGELOG.md

+- Role: credentials
+  - Added `CREDENTIALS_EXTRA_APPS` to enable the inclusion of additional Django apps in the Credentials Service.
 - Role: common
   - Renamed `COMMON_AWS_SYNC` to `COMMON_OBJECT_STORE_LOG_SYNC`
   - Renamed `COMMON_AWS_SYNC_BUCKET` to `COMMON_OBJECT_STORE_LOG_SYNC_BUCKET`

playbooks/roles/credentials/defaults/main.yml

@@ -152,6 +152,8 @@ CREDENTIALS_HOSTNAME: '~^((stage|prod)-)?credentials.*'
 NGINX_CREDENTIALS_GUNICORN_HOSTS:
   - 127.0.0.1
 
+CREDENTIALS_EXTRA_APPS: []
+
 CREDENTIALS_SERVICE_CONFIG:
   SECRET_KEY: '{{ CREDENTIALS_SECRET_KEY }}'
   TIME_ZONE: '{{ CREDENTIALS_TIME_ZONE }}'
@@ -165,6 +167,8 @@ CREDENTIALS_SERVICE_CONFIG:
   SOCIAL_AUTH_REDIRECT_IS_HTTPS: '{{ CREDENTIALS_SOCIAL_AUTH_REDIRECT_IS_HTTPS }}'
   SOCIAL_AUTH_EDX_OIDC_LOGOUT_URL: '{{ CREDENTIALS_OIDC_LOGOUT_URL }}'
 
+  EXTRA_APPS: '{{ CREDENTIALS_EXTRA_APPS }}'
+
   # db config
   DATABASE_OPTIONS:
     connect_timeout: 10