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

config/ansible/tasks/workstations/firefoxpwa.yml

@@ -14,7 +14,7 @@
   ansible.builtin.get_url:
     url: https://packagecloud.io/filips/FirefoxPWA/gpgkey
     dest: /usr/share/keyrings/firefoxpwa-keyring.gpg
-    mode: '0644'
+    mode: "0644"
   become: true
 
 - name: Import FirefoxPWA GPG key
@@ -28,7 +28,7 @@
   ansible.builtin.copy:
     content: "deb [signed-by=/usr/share/keyrings/firefoxpwa-keyring.gpg] https://packagecloud.io/filips/FirefoxPWA/any any main"
     dest: /etc/apt/sources.list.d/firefoxpwa.list
-    mode: '0644'
+    mode: "0644"
   become: true
 
 - name: Update apt cache