Task: Get cocktail suggestions to Mattermost

n8n workflow JSON:
{"id":"5","name":"Friday Evening Cocktail","nodes":[{"name":"HTTP Request","type":"n8n-nodes-base.httpRequest","position":[470,450],"parameters":{"url":" https://www.thecocktaildb.com/api/json/v1/1/random.php","options":{}},"typeVersion":1},{"name":"Mattermost","type":"n8n-nodes-base.mattermost","position":[690,450],"parameters":{"message":"=Cocktail of the week is: {{$node[\"HTTP Request\"].json[\"drinks\"][0][\"strDrink\"]}}\n{{$node[\"HTTP Request\"].json[\"drinks\"][0][\"strInstructions\"]}} Serve in {{$node[\"HTTP Request\"].json[\"drinks\"][0][\"strGlass\"]}}.","channelId":"d1iyd4h3sjyw5bph3mrebw186c","attachments":[{"image_url":"={{$node[\"HTTP Request\"].json[\"drinks\"][0][\"strDrinkThumb\"]}}"}],"otherOptions":{}},"credentials":{"mattermostApi":"Mattermost"},"typeVersion":1},{"name":"Cron","type":"n8n-nodes-base.cron","position":[230,450],"parameters":{"triggerTimes":{"item":[{"hour":18,"mode":"everyWeek","weekday":"5"}]}},"typeVersion":1}],"active":true,"settings":{"timezone":"Europe/Berlin"},"connections":{"Cron":{"main":[[{"node":"HTTP Request","type":"main","index":0}]]},"Start":{"main":[[]]},"HTTP Request":{"main":[[{"node":"Mattermost","type":"main","index":0}]]}}}