Make minio package support legacy MD5 checksum (#23768) (#23770)

Backport #23768 (no source code conflict, only some unrelated
docs/test-ini conflicts)

Some storages like:

 * https://developers.cloudflare.com/r2/api/s3/api/
 * https://www.backblaze.com/b2/docs/s3_compatible_api.html

They do not support "x-amz-checksum-algorithm" header

But minio recently uses that header with CRC32C by default. So we have
to tell minio to use legacy MD5 checksum.

custom/conf/app.example.ini

@@ -1874,6 +1874,9 @@ ROUTER = console
 ;;
 ;; Minio skip SSL verification available when STORAGE_TYPE is `minio`
 ;MINIO_INSECURE_SKIP_VERIFY = false
+;;
+;; Minio checksum algorithm: default (for MinIO or AWS S3) or md5 (for Cloudflare or Backblaze)
+;MINIO_CHECKSUM_ALGORITHM = default
 
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