Task: Get contributors information from GitHub in Slack

n8n workflow:
{"id":"5","name":"Slack-GitHub User Info","nodes":[{"name":"Webhook","type":"n8n-nodes-base.webhook","position":[300,300],"webhookId":"dacd64a7-a83e-4492-b8fe-363453906d0d","parameters":{"path":"dacd64a7-a83e-4492-b8fe-363453906d0d","options":{},"httpMethod":"POST"},"typeVersion":1},{"name":"GraphQL","type":"n8n-nodes-base.graphql","position":[500,300],"parameters":{"query":"=query {\nuser(login:\"{{$node[\"Webhook\"].json[\"body\"][\"text\"]}}\"){\nname\ncompany\nlocation\navatarUrl\nemail\npullRequests(last: 25) {\nedges {\nnode {\ncommits(last:25) {\nnodes {\ncommit {\nauthor {\nemail\nname\n}\n}\n}\n}\n}\n}\n}\n}\n}","endpoint":"https://api.github.com/graphql","requestFormat":"json","responseFormat":"string","headerParametersUi":{"parameter":[{"name":"User-Agent","value":"n8n"},{"name":"Authorization","value":"bearer <Personal Token>"}]}},"typeVersion":1},{"name":"Function","type":"n8n-nodes-base.function","position":[700,300],"parameters":{"functionCode":"let emails = [];\nlet tempEmails = [];\nconst name = $node[\"GraphQL\"].json[\"data\"][\"data\"][\"user\"][\"name\"];\nconst publicEmail = $node[\"GraphQL\"].json[\"data\"][\"data\"][\"user\"][\"email\"];\nconst username = $node[\"Webhook\"].json[\"body\"][\"text\"];\nconst nameRegex = new RegExp(name,\"g\")\n\nif(publicEmail){\n// if public email address exists, push it to the tempEmails array\n  tempEmails.push(publicEmail)\n}\n\n// looping through the pull requests\nfor(const edge of items[0].json.data.data.user.pullRequests.edges){\n // looping through the commits\n  for(node of edge.node.commits.nodes){\n\n    // Checks the name associated with the email address\n    if(nameRegex.test(node.commit.author.name)|| node.commit.author.name == username) {\n     // if name equals to contributors name or username, push the email address in tempEmails\n      tempEmails.push(node.commit.author.email)\n    }\n  }\n}\n\n// Remove duplicates\nemails = [...new Set(tempEmails)]\n\n// RegEx Pattern for email address generated by GitHub\nlet re = /^\\w+(.)*@users.noreply.github.com/\n\n// Remove the email addresses Generated by GitHub\nemails = emails.filter(email => !re.test(email))\n\n\nreturn [{json:{emails,}}]\n"},"typeVersion":1},{"name":"Slack","type":"n8n-nodes-base.slack","position":[900,300],"parameters":{"channel":"={{$node[\"Webhook\"].json[\"body\"][\"channel_id\"]}}","attachments":[{"title":"=GitHub Details for: {{$node[\"Webhook\"].json[\"body\"][\"text\"]}}"},{"text":"=*Name:*  {{$node[\"GraphQL\"].json[\"data\"][\"data\"][\"user\"][\"name\"]}}\n*Email:* {{$node[\"Function\"].json[\"emails\"].join(', ')}}\n*Company:* {{$node[\"GraphQL\"].json[\"data\"][\"data\"][\"user\"][\"company\"]}}\n*Location:* {{$node[\"GraphQL\"].json[\"data\"][\"data\"][\"user\"][\"location\"]}}"},{"thumb_url":"={{$node[\"GraphQL\"].json[\"data\"][\"data\"][\"user\"][\"avatarUrl\"]}}"}],"otherOptions":{},"authentication":"oAuth2"},"credentials":{"slackOAuth2Api":"Slack OAuth2"},"typeVersion":1}],"active":false,"settings":{},"connections":{"GraphQL":{"main":[[{"node":"Function","type":"main","index":0}]]},"Webhook":{"main":[[{"node":"GraphQL","type":"main","index":0}]]},"Function":{"main":[[{"node":"Slack","type":"main","index":0}]]}}}