如题，根据文档里的代码：
import { S3 } from "@aws-sdk/client-s3";
const s3Client = new S3({
endpoint: process.env.OSS_EXTERNAL_ENDPOINT,
region: process.env.OSS_REGION,
credentials: {
accessKeyId: process.env.OSS_ACCESS_KEY,
secretAccessKey: process.env.OSS_ACCESS_SECRET
},
forcePathStyle: true,
})
纯小白，请问下 OSS_EXTERNAL_ENDPOINT 啥的参数是在哪获取的？