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$CONFIG = {
            my_github => {
...
                         username => "sftpuser"
                       }
          };

use warnings;
use strict;
...
print {$fh} Data::Dumper->new([$CONFIG],['$CONFIG'])
    ->Useqq(1)->Sortkeys(1)->Quotekeys(0)->Dump;
close $fh;

$CONFIG = {
            my_github => {
...
                         username => "redacted"
                       }
          };