switch to custom caddy with route53 dns support

active/podman_caddy/caddy.md

@@ -1,11 +1,24 @@
 # Caddy Reverse Proxy
 
 - [Caddy Reverse Proxy](#caddy-reverse-proxy)
+  - [Custom Caddy Image](#custom-caddy-image)
   - [Install Caddy](#install-caddy)
     - [Ansible](#ansible)
     - [Manual](#manual)
   - [Adding a new Caddy Record](#adding-a-new-caddy-record)
 
+## Custom Caddy Image
+
+This repo builds a custom caddy image with route53 DNS certbot support.
+
+```bash
+podman image pull gitea.reeseapps.com/services/caddy:latest
+```
+
+To upgrade the image, check [the caddy-dns route53
+project](https://github.com/caddy-dns/route53/tags) releases and update the
+`Containerfile` with the new version.
+
 ## Install Caddy
 
 ### Ansible