Merge pull request #164 from edx/nadeem/set_dd_service_env

chore: set environment variable for the DD service

Author: nadeemshahzad

playbooks/roles/edx_django_service/templates/edx/app/app/app.sh.j2

@@ -37,6 +37,7 @@ export DD_TRACE_LOG_STREAM_HANDLER=false
 export DD_GIT_COMMIT_SHA="{{ app_version }}"
 export DD_GIT_REPOSITORY_URL="{{ edx_django_service_repository_git_url }}"
 export DD_LOGS_INJECTION=true
+export DD_SERVICE="{{ edx_django_datadog_service }}"
 {% endif -%}
 
 export EDX_REST_API_CLIENT_NAME="{{ COMMON_ENVIRONMENT }}-{{ COMMON_DEPLOYMENT }}-{{ edx_django_service_name }}"