docs: 在 README 增加启动后端的两种环境变量加载方式#30
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What
在 README 的"启动后端服务"章节增加两种环境变量加载方式的说明。
Why
./mvnw spring-boot:run不会自动读取.env文件,但 README 没有说明启动前如何加载环境变量。新贡献者按 README 走会因为 Java 进程拿不到PGPASSWORD等变量而启动失败:The server requested SCRAM-based authentication, but no password was provided.
Closes #25
How
把"启动后端服务"章节从单一命令扩展为两种方式:
set -a && . ./.env && set +a(macOS / Linux)set -a那一行附了一句简短解释,避免对该 shell 语法不熟的读者困惑。Testing
实测两种方式都能成功启动后端:
set -a && . ./.env && set +a后跑./mvnw spring-boot:run→Started BackendApplicationStarted BackendApplication未启用任何方式直接跑
./mvnw spring-boot:run会复现 SCRAM 认证失败,验证 README 新说明的必要性。