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GitHub Auto Merge Webhook Handler

Automatically merge dependabot PRs across your organization

At Sierra Softworks, we've got hundreds of repositories, many of which use Dependabot to keep their dependencies updated. On your average day, we see anywhere from 5-20 automated PRs arrive and that can take a lot of time to manage.

Previously, we've used GitHub Actions to automate the process of merging these dependabot PRs, however that requires each repository to be individually configured with the necessary GitHub Action script - not really scalable.

To solve the problem, we've built this Azure Function which can be added as an organization-level webhook handler and which will automatically (for trusted accounts) enable GitHub's built-in auto merge behaviour, or fall-back on using @dependabot merge for repos which don't have that enabled.

Configuration

When deploying this function, you will need to provide the following configuration options:

  • TRUSTED_ACCOUNTS (default: dependabot[bot],dependabot-preview[bot])

    This is the comma separated list of user accounts you trust to automatically merge PRs (once checks pass etc).

  • GITHUB_ACCESS_TOKEN (required)

    This is a GitHub Personal Access Token which has the repo scope for your organization.

  • WEBHOOK_SECRET (required)

    This is a secret string which will be used by GitHub to sign all webhook payloads as a means of securely verifying that they were sent by GitHub. Use a secure random generator to create this.