新增部分示例；更新部分镜像版本

examples/caddy/Caddyfile

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+example.com {
+  root * /var/www/wordpress
+  encode gzip
+  php_fastcgi unix//run/php/php-version-fpm.sock
+  file_server
+}
+
+a.example.com {
+  reverse_proxy http://127.0.0.1:8080
+  log {
+    output file /var/log/caddy/a.example.com.log
+  }
+}

examples/caddy/compose.yaml

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+version: "3.9"
+
+services:
+  caddy:
+    image: caddy:2.7.6-alpine
+    container_name: caddy
+    hostname: caddy
+    restart: always
+    networks:
+      - site_network
+      - app_network
+    ports:
+      - "443:443"
+    volumes:
+      - /usr/share/zoneinfo/Asia/Shanghai:/etc/localtime:ro
+      - ./hosts:/etc/hosts:ro
+      - ./Caddyfile:/etc/caddy/Caddyfile
+      - ./conf/:/config/
+      - ./site/:/var/www/
+      - ./data/:/data/
+      - ./logs/:/var/log/caddy
+      - ./cert/:/var/cert/
+
+networks:
+  site_network:
+    name: site_network
+    external: true
+#    driver: bridge
+#    driver_opts:
+#      encrypted: 'true'
+#    ipam:
+#      driver: default
+#      config:
+#        - subnet: 172.21.0.1/24
+  app_network:
+    name: app_network
+    external: true
+#    driver: bridge
+#    driver_opts:
+#      encrypted: 'true'
+#    ipam:
+#      driver: default
+#      config:
+#        - subnet: 172.21.0.1/24

examples/caddy/hosts

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+#
+# hosts         This file describes a number of hostname-to-address
+#               mappings for the TCP/IP subsystem.  It is mostly
+#               used at boot time, when no name servers are running.
+#               On small systems, this file can be used instead of a
+#               "named" name server.
+# Syntax:
+#    
+# IP-Address  Full-Qualified-Hostname  Short-Hostname
+#
+
+127.0.0.1       localhost
+
+# special IPv6 addresses
+::1             localhost ipv6-localhost ipv6-loopback
+
+fe00::0         ipv6-localnet
+
+ff00::0         ipv6-mcastprefix
+ff02::1         ipv6-allnodes
+ff02::2         ipv6-allrouters
+ff02::3         ipv6-allhosts