refactor: yml -> yaml

Signed-off-by: Tuan-Dat Tran <tuan-dat.tran@tudattr.dev>

roles/reverse_proxy/tasks/10_caddy_install.yaml

@@ -0,0 +1,23 @@
+---
+- name: Download Caddy GPG Key
+  ansible.builtin.get_url:
+    url: https://dl.cloudsmith.io/public/caddy/stable/gpg.key
+    dest: /usr/share/keyrings/caddy-stable-archive-keyring.asc
+    mode: "0644"
+  become: true
+
+- name: Add Caddy repository source list
+  ansible.builtin.apt_repository:
+    repo: "{{ item }}"
+    state: present
+  become: true
+  notify: Update apt cache
+  loop:
+    - "deb [signed-by=/usr/share/keyrings/caddy-stable-archive-keyring.asc] https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version main"
+    - "deb-src [signed-by=/usr/share/keyrings/caddy-stable-archive-keyring.asc] https://dl.cloudsmith.io/public/caddy/stable/deb/debian any-version main"
+
+- name: Install Caddy
+  ansible.builtin.apt:
+    name: caddy
+    state: present
+  become: true