Added the notification channel service. - #2

Node.js 20 is deprecated. The following actions target Node.js 20 but are being forced to run on Node.js 24: actions/setup-go@7b8cf10d4e4a01d4992d18a89f4d7dc5a3e6d6f4, arduino/setup-protoc@a8b67ba40b37d35169e222f3bb352603327985b6. For more information see: https://github.blog/changelog/2025-09-19-deprecation-of-node-20-on-github-actions-runners/

Restore cache failed: Dependencies file is not found in /home/runner/work/api/api. Supported file pattern: go.sum