feat(postgresql): add ansible role for postgresql deployment

roles/postgresql/tasks/deploy-docker.yml

@@ -62,6 +62,7 @@
     file: "initialize-docker.yml"
   when:
     - postgresql_state == 'present'
+    # TODO: determine if initialization is needed
 
 - name: Ensure postgresql container '{{ postgresql_container_name }}' is {{ postgresql_container_state }}
   community.docker.docker_container: