implemented compose by url, parse, local yaml.

roles/prometheus/tasks/main.yml

@@ -5,6 +5,7 @@
   vars:
     docker_app_env_template_src: "{{ playbook_dir }}/../roles/prometheus/templates/env.j2"
     docker_app_compose_template_src: "{{ playbook_dir }}/../roles/prometheus/templates/compose.yaml.j2"
+    docker_app_compose_override_template_src: "{{ playbook_dir }}/../roles/prometheus/templates/compose.override.yaml.j2"
     docker_app_name: "{{ prometheus_name }}"
     docker_app_dir: "{{ prometheus_dir }}"
     docker_app_image: "{{ prometheus_image }}"