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.

tests/mysql.ini.tmpl

@@ -76,6 +76,7 @@ MINIO_SECRET_ACCESS_KEY = 12345678
 MINIO_BUCKET = gitea
 MINIO_LOCATION = us-east-1
 MINIO_USE_SSL = false
+MINIO_CHECKSUM_ALGORITHM = md5
 
 [mailer]
 ENABLED = true