feat(构建文件): 添加Dockerfile

Dockerfile

@@ -0,0 +1,7 @@
+FROM caddy:2.11.1-builder-alpine AS builder
+
+RUN xcaddy build --with github.com/mholt/caddy-l4
+
+FROM caddy:2.11.1-alpine
+
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy