Task: Get a Slack alert when a workflow went wrong

n8n workflow JSON:
{"nodes":[{"name":"Slack","type":"n8n-nodes-base.slack","position":[650,300],"parameters":{"text":"=🐞 What?!\n*This execution{{$node[\"Error Trigger\"].json[\"workflow\"][\"name\"]}} went wrong*\\nWhy don't you go take a look {{$node[\"Error Trigger\"].json[\"execution\"][\"url\"]}}","channel":"","attachments":[],"otherOptions":{}},"credentials":{"slackApi":{"id":"","name":""}},"typeVersion":1},{"name":"Error Trigger","type":"n8n-nodes-base.errorTrigger","position":[450,300],"parameters":{},"executeOnce":false,"retryOnFail":false,"typeVersion":1,"alwaysOutputData":true}],"connections":{"Error Trigger":{"main":[[{"node":"Slack","type":"main","index":0}]]}}}