Add call to dependabot-automerge workflow

[leynos]

Summary

• Adds a new Dependabot auto-merge workflow that delegates to the shared action
• Ensures Dependabot PRs can be auto-merged after checks pass, using a centralized workflow

Changes

New Workflow

• .github/workflows/dependabot-automerge.yml: New workflow that
  • listens on pull_request_target for opened, reopened, synchronize, ready_for_review, labeled
  • supports manual dispatch via workflow_dispatch
  • sets permissions: contents: write, pull-requests: write, checks: read, statuses: read
  • runs only when the actor is dependabot[bot]
  • calls the reusable workflow at leynos/shared-actions@235d2d0

Rationale

• Centralizes Dependabot auto-merge behavior to a shared, tested workflow, reducing drift across repositories.

Test Plan

• Trigger workflow_dispatch to verify it invokes the reusable workflow
• Create a Dependabot PR to exercise the automerge path (in a safe/isolated PR)
• Confirm PR auto-merges automatically when the shared workflow criteria are met (as defined by the shared action)

Notes

• The workflow is intentionally gated to dependabot[bot] to avoid unintended auto-merges from other actors
• The shared workflow hash is pinned for stability

🌿 Generated by Terry

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📎 Task: https://www.terragonlabs.com/task/78a84312-6598-41b5-be67-f2608225d98b

Summary by Sourcery

Build:

• Introduce a dependabot-automerge GitHub Actions workflow that triggers on Dependabot pull_request_target events and delegates to a shared auto-merge workflow.

[sourcery-ai]

Reviewer's guide (collapsed on small PRs)

Reviewer's Guide

Adds a new GitHub Actions workflow that auto-merges Dependabot pull requests by delegating to a centralized reusable workflow with restricted permissions and actor gating.

Sequence diagram for Dependabot auto-merge reusable workflow invocation

sequenceDiagram
    actor DependabotBot
    participant GitHubRepo
    participant GHActions as GitHubActions
    participant DependabotAutomergeWorkflow as DependabotAutomergeWorkflow
    participant SharedWorkflow as SharedAutomergeWorkflow

    DependabotBot->>GitHubRepo: Open or update pull_request
    GitHubRepo-->>GHActions: pull_request_target event
    GHActions->>DependabotAutomergeWorkflow: Evaluate trigger (opened, reopened, synchronize, ready_for_review, labeled)
    DependabotAutomergeWorkflow->>DependabotAutomergeWorkflow: Check condition github.actor == dependabot[bot]
    alt actor is dependabot[bot]
        DependabotAutomergeWorkflow->>SharedWorkflow: Reusable workflow call
        SharedWorkflow->>GitHubRepo: Read checks and statuses
        SharedWorkflow->>GitHubRepo: Update PR (merge when criteria satisfied)
    else actor is not dependabot[bot]
        DependabotAutomergeWorkflow-->>GHActions: Job skipped
    end

    actor Maintainer
    Maintainer->>GHActions: workflow_dispatch (manual trigger)
    GHActions->>DependabotAutomergeWorkflow: Run on workflow_dispatch
    DependabotAutomergeWorkflow->>DependabotAutomergeWorkflow: Check condition github.actor == dependabot[bot]
    DependabotAutomergeWorkflow-->>GHActions: Usually skipped (actor is maintainer)

Loading

File-Level Changes

Change	Details	Files
Introduce a Dependabot auto-merge workflow that delegates to a shared reusable workflow.	Create a new GitHub Actions workflow triggered on pull_request_target events (opened, reopened, synchronize, ready_for_review, labeled) and manual workflow_dispatch. Configure workflow permissions to allow writing contents and pull requests, and reading checks and statuses. Restrict the workflow job execution to runs where the GitHub actor is dependabot[bot]. Invoke the shared dependabot-automerge reusable workflow pinned to a specific commit hash in the leynos/shared-actions repository.	.github/workflows/dependabot-automerge.yml

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