playbook: disable unnecessary facts gathering

CHANGELOG.md

@@ -5,6 +5,10 @@ The format is based on [Keep a Changelog](https://keepachangelog.com/en/1.0.0/),
 and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0.html).
 
 ## [Unreleased]
+### Fixed
+- sample playbook:
+  - disable unnecessary facts gathering
+  - pin docker image by specifying digest (no longer trust registry)
 
 ## [1.0.0] - 2020-01-04
 

ansible-playbook.yml

@@ -1,5 +1,6 @@
 - hosts: [some-host]
   become: true
+  gather_facts: no
   tasks:
   - docker_network:
       name: tor