Add Template to deploy forgejo.

This template allows deploying a forgejo en either Scaleway or Hetzner
(untested) without much knowledge about them.
It DOES require knowledge about Terragrunt and ansible. A wizard of
sorts is provided but it will not guarantee success without some
knowledge about the underlying technology.

ansible/roles/forgejo/tasks/backup.yml

@@ -0,0 +1,32 @@
+---
+# Backup configuration tasks
+
+- name: Create backup script
+  ansible.builtin.template:
+    src: forgejo_backup.sh.j2
+    dest: /usr/local/bin/forgejo_backup.sh
+    mode: '0755'
+  become: yes
+
+- name: Set up backup cron job
+  ansible.builtin.cron:
+    name: "Forgejo daily backup"
+    minute: "{{ forgejo_backup_schedule.split()[0] }}"
+    hour: "{{ forgejo_backup_schedule.split()[1] }}"
+    job: "/usr/local/bin/forgejo_backup.sh >> /var/log/forgejo-backup.log 2>&1"
+  become: yes
+
+- name: Create log rotation for backup logs
+  ansible.builtin.copy:
+    dest: /etc/logrotate.d/forgejo-backup
+    content: |
+      /var/log/forgejo-backup.log {
+          daily
+          rotate 7
+          compress
+          delaycompress
+          missingok
+          notifempty
+      }
+    mode: '0644'
+  become: yes