perf(dockerfile): 🎈 尝试优化 dockerfile 构建速度

caddy/7.4/Dockerfile

@@ -1,3 +1,4 @@
+FROM caddy AS base
 FROM php:7-fpm-alpine
 
 LABEL version="7.4" \
@@ -20,10 +21,10 @@ RUN sed -i 's/dl-cdn.alpinelinux.org/mirrors.aliyun.com/g' /etc/apk/repositories
 		/usr/share/caddy 
 
 # 添加 Caddy
-COPY --from=caddy /usr/bin/caddy /usr/bin/caddy
+COPY --from=base /usr/bin/caddy /usr/bin/caddy
 COPY caddy/7.4/Caddyfile /etc/caddy/
-COPY --from=caddy /usr/share/caddy /usr/share/caddy
-COPY --from=caddy /etc/nsswitch.conf /etc/nsswitch.conf
+COPY --from=base /usr/share/caddy /usr/share/caddy
+COPY --from=base /etc/nsswitch.conf /etc/nsswitch.conf
 
 
 # See https://caddyserver.com/docs/conventions#file-locations for details