feat(deploy): 一条命令链部署——双单文件 + Caddy + DATABASE_URL 单源
多阶段镜像编出 server/engine 单文件与前端静态;compose 起 pg/server/engine/caddy; 启动时自动迁移;仅用 DATABASE_URL,postgres 建库参数由 entrypoint 拆解。
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#!/bin/sh
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# 从 DATABASE_URL 拆出官方镜像建库所需的 POSTGRES_*,再交回原入口
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set -e
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if [ -z "$DATABASE_URL" ]; then
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echo "DATABASE_URL is required" >&2
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exit 1
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fi
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u="${DATABASE_URL#*://}"
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auth="${u%%@*}"
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rest="${u#*@}"
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export POSTGRES_USER="${auth%%:*}"
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export POSTGRES_PASSWORD="${auth#*:}"
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export POSTGRES_DB="${rest#*/}"
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export POSTGRES_DB="${POSTGRES_DB%%\?*}"
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exec docker-entrypoint.sh postgres
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