style: add YAML document start markers to Ansible playbooks and tasks

config/ansible/tasks/global/docker.yml

@@ -1,3 +1,4 @@
+---
 - name: Check if Docker CE is installed
   ansible.builtin.command: docker --version
   register: docker_check
@@ -8,7 +9,7 @@
   ansible.builtin.get_url:
     url: https://get.docker.com
     dest: /tmp/get-docker.sh
-    mode: '0755'
+    mode: "0755"
   when: docker_check.rc != 0
 
 - name: Install Docker CE