Draft: Resolve "backup all installed apps and system"

Closes #25 (closed)

tasks/backup.yml

+---
+#-----------------------------------------------------------------------------#
+# ansible-yunohost allows to deploy Yunohost using Ansible                    #
+# Copyright 2021-2021 Lydra https://www.lydra.fr/                             #
+#                                                                             #
+# this program is free software: you can redistribute it and/or modify        #
+# it under the terms of the GNU General Public License as published by        #
+# the Free Software Foundation, either version 3 of the License, or           #
+# (at your option) any later version.                                         #
+#                                                                             #
+# this program is distributed in the hope that it will be useful,             #
+# but WITHOUT ANY WARRANTY; without even the implied warranty of              #
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the                #
+# GNU General Public License for more details.                                #
+#                                                                             #
+# You should have received a copy of the GNU General Public License           #
+# along with this program. If not, see <http://www.gnu.org/licenses/>.        #
+#                                                                             #
+#-----------------------------------------------------------------------------#
+
+- name: Create backup folder
+  ansible.builtin.file:
+    path: "{{ ynh_apps_backup.directory | default('/home/yunohost.backup/archives') }}"
+    state: directory
+    mode: '0750'
+  tags: test
+- name: Create apps backup script
+  ansible.builtin.template:
+    src: "{{ ynh_apps_backup.src_script | default('templates/ynh_apps_backup.sh.j2') }}"
+    dest: "{{ ynh_apps_backup.dest_script | default('/usr/local/bin/') }}ynh_apps_backup.sh"
+    owner: root
+    group: root
+    mode: '0740'
+  tags: test
+- name: Create cron task to perform YNH apps backup
+  ansible.builtin.cron:
+    name: "auto-backup apps to {{ ynh_apps_backup.directory | default('/home/yunohost.backup/archives') }}"
+    month: "{{ ynh_apps_backup.scheduled_month | default('*') }}"
+    weekday: "{{ ynh_apps_backup.scheduled_weekday | default('*') }}"
+    hour: "{{ ynh_apps_backup.scheduled_hour | default('1') }}"
+    minute: "{{ ynh_apps_backup.scheduled_minute | default('0') }}"
+    user: root
+    job: "{{ ynh_apps_backup.dest_script | default('/usr/local/bin/') }}ynh_apps_backup.sh"
+    cron_file: ynh_apps_backup_cron
+  tags: test