Switch caddy to use json configuration

roles/caddy/tasks/main.yml

@@ -12,9 +12,9 @@
 
 - name: Ensure Caddyfile exists
   ansible.builtin.template:
-    src: Caddyfile.j2
-    dest: "{{ caddy_caddyfile_dir }}/Caddyfile"
-    validate: "docker run --rm -v %s:/Caddyfile caddy caddy validate --config /Caddyfile"
+    src: config.json.j2
+    dest: "{{ caddy_caddyfile_dir }}/config.json"
+    validate: "docker run --rm -v %s:/config.json peterdavehello/jsonlint jsonlint -q /config.json"
   become: true
   tags:
     - fs