ci: add reusable workflow to comment on first-time PRs

[kushu30]

Summary

Adds a reusable GitHub Actions workflow that comments on a contributor’s first pull request if they have no previously merged PRs in the repository. This workflow is designed to live in the .github repo and be referenced from individual project PR pipelines (for example, talawa-admin/.github/workflows/pull-request.yml).

Motivation

Multiple PalisadoesFoundation repositories require consistent contributor onboarding behavior. Centralizing this logic in the .github repository avoids duplication and allows repositories to opt in by referencing a single, maintained workflow.

Implementation Details

• Introduces .github/workflows/pull-request-comment.yml as a reusable workflow_call workflow
• Uses actions/github-script to detect whether the PR author has any previously merged pull requests
• Posts a single welcome comment only for first-time contributors
• Does not trigger on its own and must be explicitly referenced by consuming repositories

Follow-up

After this is merged, a small follow-up PR will reference this workflow from talawa-admin’s pull-request.yml.

No breaking changes.

Summary by CodeRabbit

• Chores
  • Added automated workflow to recognize and welcome first-time pull request contributors with a thank-you message and review acknowledgment.

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

[github-actions]

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[coderabbitai]

Caution

Review failed

The pull request is closed.

Walkthrough

A new GitHub Actions workflow is introduced that detects first-time pull request contributors. The workflow retrieves the PR author, queries the repository's closed pull requests via pagination to verify merge history, and posts a welcome comment if the author has no previously merged pull requests.

Changes

Cohort / File(s)	Summary
First PR Detection Workflow .github/workflows/pull-request-comment.yml	New workflow triggered on workflow_call that uses GitHub Script to fetch PR author details, check closed PRs for prior merges, and post a welcome comment for first-time contributors.

Sequence Diagram(s)

sequenceDiagram
    participant Workflow as GitHub Actions
    participant Script as GitHub Script Action
    participant API as GitHub API
    participant PR as Pull Request

    Workflow->>Script: Trigger on workflow_call
    Script->>API: Fetch PR context
    API-->>Script: Return PR author & metadata
    Script->>API: Query closed PRs (paginated)
    API-->>Script: Return paginated PR list
    Script->>Script: Check if author has merged PRs
    alt First PR by author
        Script->>API: Post welcome comment
        API-->>PR: Comment added
    else Has prior merges
        Script->>Script: Skip comment
    end

Loading

Estimated code review effort

🎯 2 (Simple) | ⏱️ ~12 minutes

Poem

🐰 A new workflow hops into view,
Welcoming first-timers, tried and true!
Pagination checked, a comment is blessed,
To thank fresh contributors at their best. 🌟

✨ Finishing touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Post copyable unit tests in a comment

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[github-actions]

PR validation failed: No linked issue and no valid closing issue reference in PR description