Slack Notification - Error: self-signed certificate

[dschier-wtd]

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Description

After deploying Uptime Kuma in Kubernetes with a valid TLS certificate via Traefik, I also want to send notifications to slack. I have set up a webhook and tested it with the provided curl command. After entering the webhook url in Uptime Kuma, I also tested it there. Unfortunately, it results in a pop up "Error: self-signed certificate" and logs like the below snippet:

Error: Error: Error: self-signed certificate
    at Slack.throwGeneralAxiosError (/app/server/notification-providers/notification-provider.js:38:15)
    at Slack.send (/app/server/notification-providers/slack.js:107:18)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async Socket.<anonymous> (/app/server/server.js:1304:27)

👟 Reproduction steps

1. Install Uptime Kuma 1.23.16
2. Create a slack app with an incoming webhook
3. Add it to Uptime Kuma
4. Save and Hit the Test Button

👀 Expected behavior

Test notification is sent

😓 Actual Behavior

Getting Error: self-signed certificate

🐻 Uptime-Kuma Version

1.23.16

💻 Operating System and Arch

AlmaLinux 9.4

🌐 Browser

Safari

🖥️ Deployment Environment

• Runtime: Kubernetes 1.32.2
• Database: the default in the official docker container
• Filesystem used to store the database on: XFS
• number of monitors: 2

📝 Relevant log output

Error: Error: Error: self-signed certificate
    at Slack.throwGeneralAxiosError (/app/server/notification-providers/notification-provider.js:38:15)
    at Slack.send (/app/server/notification-providers/slack.js:107:18)
    at process.processTicksAndRejections (node:internal/process/task_queues:95:5)
    at async Socket.<anonymous> (/app/server/server.js:1304:27)