Modify the webhook bot to add 'ready-to-test' label for Dependabot PRs

[tpantelis]

...and remove it from the Coderabbit trigger GH action. The latter does not trigger the additional E2E jobs when the label is added. This is a security feature in GitHub whereby it does not trigger subsequent workflow runs when a GH Action uses the default GITHUB_TOKEN. The action would have to use a Personal Access or GitHub App Token. But rather than doing that, we can enhance the existing webhook bot to do this since it already has an appropriate token and already adds the 'ready-to-test' label when approvals are met.

Summary by CodeRabbit

• New Features

  • Dependabot pull requests are now automatically marked with an approved label when opened.

• Chores

  • Removed automatic label assignment from the auto-merge workflow, streamlining the process.

_{✏️ Tip: You can customize this high-level summary in your review settings.}

[submariner-bot]

🤖 Created branch: z_pr240/tpantelis/add_rtt_in_bot

[coderabbitai]

Walkthrough

This pull request removes the "ready-to-test" label application from the CodeRabbit trigger workflow and introduces automatic label application for Dependabot-opened pull requests in the handler, streamlining the labeling behavior for bot-initiated PRs.

Changes

Cohort / File(s)	Summary
Workflow Label Removal .github/workflows/coderabbit-trigger.yml	Removed the block that adds the "ready-to-test" label after enabling auto-merge, simplifying the control flow to only enable auto-merge without subsequent label mutations.
Dependabot PR Auto-Labeling pkg/handler/pullrequest/handler.go	Added isDependabotPR() helper to detect Dependabot PRs by author variants, and introduced conditional logic in openOrSync() to automatically apply the approved label when a Dependabot PR is opened (if LabelApproved config exists), with error logging.

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~10 minutes

Possibly related PRs

• Modify CodeRabbit trigger workflow to add the ready-to-test label #239: Modifies .github/workflows/coderabbit-trigger.yml with conflicting changes around the "ready-to-test" label step.
• Modify CodeRabbit trigger workflow to Enable auto-merge #235: Adjusts the auto-merge flow in .github/workflows/coderabbit-trigger.yml, with this PR removing the subsequent label step.
• Add reusable workflow to trigger CodeRabbit review on bot PRs #231: Modifies bot-PR handling in .github/workflows/coderabbit-trigger.yml workflow configuration.

Suggested reviewers

• Oats87
• sridhargaddam
• skitt

🚥 Pre-merge checks | ✅ 3

✅ Passed checks (3 passed)

Check name	Status	Explanation
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title accurately describes the main change: modifying the webhook bot to add 'ready-to-test' label for Dependabot PRs, which is the primary objective documented in the PR.
Actionable Comments Resolved	✅ Passed	No unresolved actionable comments found. Pre-existing TODO comments are unrelated to this PR. Implementation is complete and focused with proper label application.

_{✏️ Tip: You can configure your own custom pre-merge checks in the settings.}

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[submariner-bot]

🤖 Closed branches: [z_pr240/tpantelis/add_rtt_in_bot]