public void setTrustCertCollection(final Resource trustCertCollection) {
            this.trustCertCollection = trustCertCollection;
        }
Sets the resource containing the trusted certificate collection. If not set ({@code null}) it will use the
system's default collection (Default). This collection will be used to verify server certificates.

@param trustCertCollection The path to the trusted certificate collection.

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