Add rate limiter to caddy

Dockerfile

@@ -1,6 +1,7 @@
 # Install Caddy
 FROM docker.io/caddy:builder-alpine AS caddy-builder
-RUN xcaddy build
+RUN xcaddy build \
+    --with github.com/mholt/caddy-ratelimit
 
 
 # Install PHP

config/Caddyfile

@@ -5,6 +5,17 @@
 	}
 }
 
+rate_limit {
+	distributed
+	zone dynamic {
+		key    {client_ip}
+		events 20
+		window 5s
+        jitter 0.1
+	}
+	log_key
+}
+
 :8080 {
     root * /phpbb/www