public int getPort() {
        if (this.port == 0) {
            this.port = SocketUtils.findAvailableTcpPort();
        }
        return this.port;
    }
Gets the port the server should listen on. Defaults to {@code 9090}. If set to {@code 0} a random available port
will be selected and used.

@return The server port to listen to.

@see #setPort(int)
grpc-server-spring-boot-starter/src/main/java/net/devh/boot/grpc/server/config/GrpcServerProperties.java