add Caddy docker configuration

add Caddy Dockerfile to build image using xcaddy including cloudflare modules
docker-compose.yml file builds image instead of pulling it

caddy/docker-compose.yml

@@ -0,0 +1,32 @@
+name: caddy
+services:
+  caddy:
+    build: .
+    restart: unless-stopped
+    networks:
+      - proxy-net
+    ports:
+      - "80:80"
+      - "443:443"
+      - "443:443/udp"
+      - "2019:2019"
+    configs:
+      - source: caddyfile
+        target: /etc/caddy/Caddyfile
+    volumes:
+      - ./data/site:/srv
+      - ./data/logs:/logs
+      - caddy_data:/data
+      - caddy_config:/config
+
+networks:
+  proxy-net:
+    external: true
+
+configs:
+  caddyfile:
+    file: ./Caddyfile
+
+volumes:
+  caddy_data:
+  caddy_config: