When trying to use a self-certificate in secure-forward, it is not possible to use it with the following error

````
2022-01-26 19:18:23 +0900 [warn]: [fluentd_secure_forward] failed to flush the buffer. retry_time=7 next_retry_seconds=2022-01-26 19:19:21 +0900 chunk="5d66574c278460cca88588acb1d6b6a9" error_class=OpenSSL::SSL::SSLError error="SSL_connect returned=1 errno=0 state=error: certificate verify failed (self signed certificate)".
```
I think it is possible to avoid this problem if I can put "tls_allow_self_signed_cert true" in fluentd.conf, but fluentd.conf cannot be changed because it is managed by Operator.
Is there any support for using self-signed certificates in secure-forward?

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