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/redis.yml

@@ -0,0 +1,40 @@
+---
+# Redis setup tasks
+
+- name: Install Redis
+  ansible.builtin.apt:
+    name:
+      - redis-server
+      - redis-tools
+    state: present
+    update_cache: yes
+  become: yes
+
+- name: Configure Redis
+  ansible.builtin.lineinfile:
+    path: /etc/redis/redis.conf
+    regexp: "{{ item.regexp }}"
+    line: "{{ item.line }}"
+    state: present
+  become: yes
+  loop:
+    - { regexp: '^bind', line: 'bind 127.0.0.1 ::1' }
+    - { regexp: '^protected-mode', line: 'protected-mode yes' }
+    - { regexp: '^maxmemory', line: 'maxmemory 256mb' }
+    - { regexp: '^maxmemory-policy', line: 'maxmemory-policy allkeys-lru' }
+    - { regexp: '^save', line: 'save 900 1' }
+  notify: Restart Redis
+
+- name: Ensure Redis is started and enabled
+  ansible.builtin.systemd:
+    name: redis-server
+    state: started
+    enabled: yes
+  become: yes
+
+- name: Test Redis connection
+  ansible.builtin.command:
+    cmd: redis-cli ping
+  register: redis_ping
+  changed_when: false
+  failed_when: redis_ping.stdout != "PONG"