feat: add coolify installation role

roles/coolify/defaults/main.yml

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+---
+coolify_installer_url: "https://cdn.coollabs.io/coolify/install.sh"
+coolify_installer_dest: "/tmp/coolify-install.sh"
+coolify_data_dir: "/data/coolify"
+coolify_compose_file: "{{ coolify_data_dir }}/source/docker-compose.yml"
+
+## Pin to a release (e.g. "v4.0.0") or leave empty for latest.
+coolify_version: ""
+
+## Coolify self-updates by default; set false to manage upgrades yourself.
+coolify_autoupdate: true

roles/coolify/tasks/main.yml

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+---
+- name: Check if Coolify is already installed
+  ansible.builtin.stat:
+    path: "{{ coolify_compose_file }}"
+  register: coolify_installed
+
+- name: Download Coolify installer
+  ansible.builtin.get_url:
+    url: "{{ coolify_installer_url }}"
+    dest: "{{ coolify_installer_dest }}"
+    mode: "0755"
+  when: not coolify_installed.stat.exists
+
+- name: Run Coolify installer
+  become: true
+  ansible.builtin.command:
+    argv:
+      - "{{ coolify_installer_dest }}"
+      - "{{ coolify_version }}"
+  environment:
+    AUTOUPDATE: "{{ coolify_autoupdate | bool | ternary('true', 'false') }}"
+  when: not coolify_installed.stat.exists
+  changed_when: true
+  async: 1800
+  poll: 15