public void setPrivateKey(final Resource privateKey) {
            this.privateKey = privateKey;
        }
Sets the resource containing the private key. Required if {@link #isClientAuthEnabled} is true.

@param privateKey The private key resource.

@see SslContextBuilder#keyManager(InputStream, InputStream, String)
grpc-client-spring-boot-starter/src/main/java/net/devh/boot/grpc/client/config/GrpcChannelProperties.java