Add borgbackup_server role

roles/borgbackup_server/defaults/main.yml

@@ -0,0 +1,5 @@
+---
+borg_server_user: borgbackup
+borg_server_group: borgbackup
+borg_home_dir: /var/lib/borgbackup
+...

roles/borgbackup_server/tasks/main.yml

@@ -0,0 +1,47 @@
+---
+- name: Install borg
+  apt:
+    name: borgbackup
+    state: latest
+    update_cache: true
+  register: apt_result
+  retries: 3
+  until: apt_result is succeeded
+
+- name: Create a local group for borg
+  become: true
+  group:
+    name: "{{ borg_server_group }}"
+    system: true
+
+- name: Create a local user for borg
+  become: true
+  user:
+    home: "{{ borg_home_dir }}"
+    create_home: true
+    comment: Local user for borgbackup server
+    name: "{{ borg_server_user }}"
+    group: "{{ borg_server_group }}"
+    system: true
+    # Does not constitute a valid hash, preventing from login via password
+    password: "*"
+    update_password: always
+
+- name: Create backup directory
+  become: true
+  file:
+    path: "{{ borg_server_backups_dir }}"
+    state: directory
+    owner: "{{ borg_server_user }}"
+    group: "{{ borg_server_group }}"
+    mode: u=rw
+
+- include_role:
+    name: update_motd
+  vars:
+    motd_messages:
+      - key: 10-borg-server
+        message: >-
+          Les sauvegardes (borg) sont stockées dans
+          {{ borg_server_backups_dir }}.
+...