Invalid certificate generate for wildcard

I am using openresty as container or docker. when certificate generate it shows invalid certificate or when run url it show warning. The error like unknown issuer, or verified by : not specified, could not verify this certificate because issuer is unknown, etc.

How can generate valid certificate.

I did added below command:
RUN openssl req -new -newkey rsa:2048 -days 3650 -nodes -x509 -subj '/CN=sni-support-required-for-valid-ssl' -keyout /etc/ssl/resty-auto-ssl-fallback.key -out /etc/ssl/resty-auto-ssl-fallback.crt

Start by reproducing the Docker/OpenResty setup and examining the fallback certificate command shown in the report. Compare the generated certificate's issuer and hostname coverage with the requested wildcard URL. Done means the reported URL presents a valid, verifiable certificate without the unknown-issuer warning.

Written by the indexing model from the issue text.