feat(snipe_it): add ansible role for deployment

roles/snipe_it/defaults/main/config.yml

@@ -85,7 +85,7 @@ snipe_it_base_config:
   DB_HOST: "{{ snipe_it_config_db_host }}"
   DB_PORT: "{{ snipe_it_config_db_port }}"
   DB_DATABASE: "{{ snipe_it_config_db_database }}"
-  DB_USERNAME: "{{ snipe_it_config_mail_username }}"
+  DB_USERNAME: "{{ snipe_it_config_db_username }}"
   DB_PASSWORD: "{{ snipe_it_config_db_password }}"
   DB_PREFIX: "{{ snipe_it_config_db_prefix | default('null', true) }}"
   DB_DUMP_PATH: "{{ snipe_it_config_db_dump_path }}"