fix permission warning when adding apt repository

this was experienced when running it against debian 10 and the warning in question is:
```
[WARNING]: File '/etc/apt/sources.list.d/download_docker_com_linux_debian.list' created with default permissions '600'. The previous default was '666'. Specify 'mode' to avoid this warning.
```
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insanitywholesale 2020-08-20 17:31:51 +03:00 committed by GitHub
parent d9aa992bcd
commit 11b1c67f9a
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@ -38,3 +38,4 @@
repo: "{{ docker_apt_repository }}"
state: present
update_cache: true
mode: "0644"