message: make prefetch configurable
diff: @@ -71,6 +71,9 @@ const rabbitmqHost = process.env.RABBITMQ_HOST || 'broker';
  const rabbitmqUsername = process.env.RABBITMQ_USERNAME || 'guest';
  const rabbitmqPassword = process.env.RABBITMQ_PASSWORD || 'guest';
  +const taskPrefetch = process.env.TASK_PREFETCH_COUNT || 2;
  +const taskMonitorPrefetch = process.env.TASKMONITOR_PREFETCH_COUNT || 1;
  +
  class UnknownActiveSystem extends Error {
  constructor(message) {
  super(message);
  @@ -761,7 +764,7 @@ export const consumeTasks = async function(
  'lagoon-tasks',
  taskQueueName
  ),
  - channel.prefetch(2),
  + channel.prefetch(taskPrefetch),
  channel.consume(`lagoon-tasks:${taskQueueName}`, onMessage, {
  noAck: false
  })
  @@ -834,7 +837,7 @@ export const consumeTaskMonitor = async function(
  'lagoon-tasks-monitor',
  taskMonitorQueueName
  ),
  - channel.prefetch(6),
  + channel.prefetch(taskMonitorPrefetch),
  channel.consume(
  `lagoon-tasks-monitor:${taskMonitorQueueName}`,
  onMessage,
  