Improving yamllint configuration (#11389)

Signed-off-by: Bas Meijer <bas.meijer@enexis.nl>

roles/container-engine/docker/tasks/systemd.yml

@@ -3,13 +3,13 @@
   file:
     path: /etc/systemd/system/docker.service.d
     state: directory
-    mode: 0755
+    mode: "0755"
 
 - name: Write docker proxy drop-in
   template:
     src: http-proxy.conf.j2
     dest: /etc/systemd/system/docker.service.d/http-proxy.conf
-    mode: 0644
+    mode: "0644"
   notify: Restart docker
   when: http_proxy is defined or https_proxy is defined
 
@@ -27,7 +27,7 @@
   template:
     src: docker.service.j2
     dest: /etc/systemd/system/docker.service
-    mode: 0644
+    mode: "0644"
   register: docker_service_file
   notify: Restart docker
   when:
@@ -38,14 +38,14 @@
   template:
     src: docker-options.conf.j2
     dest: "/etc/systemd/system/docker.service.d/docker-options.conf"
-    mode: 0644
+    mode: "0644"
   notify: Restart docker
 
 - name: Write docker dns systemd drop-in
   template:
     src: docker-dns.conf.j2
     dest: "/etc/systemd/system/docker.service.d/docker-dns.conf"
-    mode: 0644
+    mode: "0644"
   notify: Restart docker
   when: dns_mode != 'none' and resolvconf_mode == 'docker_dns'
 
@@ -53,14 +53,14 @@
   copy:
     src: cleanup-docker-orphans.sh
     dest: "{{ bin_dir }}/cleanup-docker-orphans.sh"
-    mode: 0755
+    mode: "0755"
   when: docker_orphan_clean_up | bool
 
 - name: Write docker orphan clean up systemd drop-in
   template:
     src: docker-orphan-cleanup.conf.j2
     dest: "/etc/systemd/system/docker.service.d/docker-orphan-cleanup.conf"
-    mode: 0644
+    mode: "0644"
   notify: Restart docker
   when: docker_orphan_clean_up | bool