Task: Post RSS feed items from yesterday to Slack

n8n workflow JSON:
{"id":89,"name":"Post RSS feed items from yesterday to Slack","nodes":[{"name":"Build our message","type":"n8n-nodes-base.function","position":[1160,400],"parameters":{"functionCode":"// Create our Slack message\n// This will output a list of RSS items in the following format\n// Title - Description\nlet message = \"*:new: Posts from yesterday :new:*\\n\\n\";\n\n// Loop the input items\nfor (item of items) {\n  message += \"*<\" + item.json.link + \"|\" + item.json.title + \">*\\n\" + item.json.contentSnippet + \"\\n\\n\"; \n}\n\n// Return our message\nreturn [{json: {message}}];"},"typeVersion":1},{"name":"Every Morning","type":"n8n-nodes-base.cron","position":[380,420],"parameters":{"triggerTimes":{"item":[{"hour":8}]}},"typeVersion":1},{"name":"Get Yesterdays Date","type":"n8n-nodes-base.dateTime","position":[560,420],"parameters":{"value":"={{Date()}}","action":"calculate","options":{},"duration":1,"operation":"subtract"},"typeVersion":1},{"name":"Get the RSS Feed","type":"n8n-nodes-base.rssFeedRead","position":[740,420],"parameters":{"url":"https://n8n.io/blog/rss"},"typeVersion":1},{"name":"If it was published after yesterday","type":"n8n-nodes-base.if","position":[940,420],"parameters":{"conditions":{"dateTime":[{"value1":"={{$item(0).$node[\"Get Yesterdays Date\"].json.data}}","value2":"={{$json[\"pubDate\"]}}","operation":"before"}]}},"typeVersion":1,"continueOnFail":true},{"name":"Post to Slack","type":"n8n-nodes-base.slack","position":[1340,400],"parameters":{"text":"={{$json[\"message\"]}}","channel":"#news","blocksUi":{"blocksValues":[]},"attachments":[],"otherOptions":{}},"credentials":{"slackApi":{"id":"53","name":"Slack Access Token"}},"typeVersion":1}],"active":false,"settings":{},"connections":{"Every Morning":{"main":[[{"node":"Get Yesterdays Date","type":"main","index":0}]]},"Get the RSS Feed":{"main":[[{"node":"If it was published after yesterday","type":"main","index":0}]]},"Build our message":{"main":[[{"node":"Post to Slack","type":"main","index":0}]]},"Get Yesterdays Date":{"main":[[{"node":"Get the RSS Feed","type":"main","index":0}]]},"If it was published after yesterday":{"main":[[{"node":"Build our message","type":"main","index":0}]]}}}