public Resource getTrustStore() {
            return this.trustStore;
        }
The resource containing the trust store. Cannot be used in conjunction with {@link #trustCertCollection}. If
neither this nor {@link #trustCertCollection} is set then the system's trust store will be used.

@return The trust store resource or null.
grpc-client-spring-boot-starter/src/main/java/net/devh/boot/grpc/client/config/GrpcChannelProperties.java