Task: Send a message to an ActiveMQ queue via AMQP Sender

n8n workflow JSON:
{"id":"134","name":"Send a message to an ActiveMQ queue via AMQP Sender","nodes":[{"name":"On clicking 'execute'","type":"n8n-nodes-base.manualTrigger","position":[250,300],"parameters":{},"typeVersion":1},{"name":"AMQP Sender","type":"n8n-nodes-base.amqp","position":[650,300],"parameters":{"sink":""},"credentials":{"amqp":""},"typeVersion":1},{"name":"Set","type":"n8n-nodes-base.set","position":[450,300],"parameters":{"values":{"string":[{"name":"my_key","value":"my_value"}]},"options":{}},"typeVersion":1}],"active":false,"settings":{},"connections":{"Set":{"main":[[{"node":"AMQP Sender","type":"main","index":0}]]},"On clicking 'execute'":{"main":[[{"node":"Set","type":"main","index":0}]]}}}