add xcaddy build script

Changed files
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build-caddy.sh
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#!/bin/bash
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xcaddy build \
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--with github.com/caddyserver/caddy \
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--with github.com/mholt/caddy-l4 \
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--with github.com/caddy-dns/namecheap \
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--with github.com/caddyserver/certmagic \
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--with github.com/libdns/libdns