feat(workflow): add action to trigger PR creation on issue comments or manual runs

This commit introduces a new GitHub Actions workflow that listens for issue comments
of type 'created' and also supports manual triggering via workflow_dispatch. The goal
is to automate PR-related tasks — such as automatically opening or modifying pull
requests — based on comments made on issues or via admin control.

Key Features:
- Listens for issue_comment events (e.g. `/create-pr`)
- Can be triggered manually using workflow_dispatch
- Grants scoped permissions to write to contents and pull requests

Use Cases:
- Enable maintainers to trigger automated PRs via comments
- Support CI/CD pipelines that require comment-based automation
- Enhance contributor and bot collaboration (e.g., Dependabot integration)

Security Notes:
- Only users with write permissions on the fork will be able to push changes
- Permissions are limited to only what's necessary: `contents: write`, `pull-requests: write`

Next Steps:
- Add conditionals to filter comments (e.g. specific slash commands)
- Extend with job steps to create or modify PRs automatically

This workflow is foundational for scaling automation in this repo while keeping manual
control where necessary.

Signed-off-by: AIC-HMV <security@aic-hmv.org>

Author: Hung Minh Vo

.github/workflows/create-changelog-pr.yml .github/workflows/auto-pr-on-comment.yml.github/workflows/create-changelog-pr.yml renamed to .github/workflows/auto-pr-on-comment.yml

@@ -1,4 +1,11 @@
-name: Create a PR to add an entry to the CHANGELOG.md file in this repo
+feat: trigger PR creation on issue comment or manual dispatch
+
+This workflow listens for new issue comments or manual workflow dispatches,
+and initiates automated PR logic with write access to contents and pull requests.
+
+Use case: automating contributor PR triggers from comment-based commands.
+name: 
+Create a PR to add an entry to the CHANGELOG.md file in this repo
 
 # **What it does**: If a member of the github org posts a changelog comment, it creates a PR to update the CHANGELOG.md file.
 # **Why we have it**: This surfaces docs changelog details publicly.