Build for Caddy V2

Dockerfile

@@ -1,6 +1,8 @@
-FROM alpine:latest
-RUN apk add --update --no-cache openssl-dev musl-dev zlib-dev curl tzdata
+FROM caddy:2-builder-alpine AS builder
 
-WORKDIR /root/
-COPY caddy-server /root/
-CMD ["./caddy-server -conf Caddyfile"]
+RUN xcaddy build \
+    --with github.com/caddy-dns/cloudflare
+
+FROM caddy:2-alpine
+
+COPY --from=builder /usr/bin/caddy /usr/bin/caddy