DuplicateStageName （重复舞台名称）
目录
输出
Duplicate stage name 'foo-base', stage names should be unique描述
定义多个具有相同名称的阶段会导致错误，因为 Builder 无法唯一解析阶段名称引用。
例子
❌ 坏：builder被声明为阶段名称两次。
FROM debian:latest AS builder
RUN apt-get update; apt-get install -y curl
FROM golang:latest AS builder✅ Good：阶段具有唯一的名称。
FROM debian:latest AS deb-builder
RUN apt-get update; apt-get install -y curl
FROM golang:latest AS go-builder