add caddy plugins

caddy/Dockerfile

@@ -1,8 +1,12 @@
-FROM caddy:2.7-builder AS builder
+FROM caddy:2.9-builder AS builder
 
 RUN xcaddy build \
-    --with github.com/caddy-dns/route53
+    --with github.com/caddy-dns/route53 \
+    --with github.com/mholt/caddy-dynamicdns \
+    --with github.com/zhangjiayin/caddy-geoip2 \
+    --with github.com/mholt/caddy-l4 \
+    --with github.com/greenpau/caddy-security
 
-FROM caddy:2.7-alpine
+FROM caddy:2.9-alpine
 
 COPY --from=builder /usr/bin/caddy /usr/bin/caddy