Apply ansible-lint fixes

ansible/roles/docker/tasks/main.yaml

@@ -28,7 +28,7 @@
 - name: Retrieve dpkg architecture
   check_mode: false
   ansible.builtin.command: dpkg --print-architecture
-  register: dpkg_architecture
+  register: docker_dpkg_architecture
   changed_when: false
 
 - name: Add Docker apt repository
@@ -36,7 +36,7 @@
   ansible.builtin.template:
     src: docker.list.j2
     dest: /etc/apt/sources.list.d/docker.list
-    mode: 0644
+    mode: "u=rw,g=r,o=r"
 
 - name: Install Docker
   become: true