Automatically merge Dependabot PRs when tests pass

[runleveldev]

Summary

Set up automation to automatically merge Dependabot pull requests once all required tests have passed in mieweb/LDAPServer.

Expected Outcome

• Dependabot PRs are automatically merged when CI checks succeed
• Integration with existing test workflows (including OpenLDAP test suite)
• Documentation updated to reflect the automation policy

Steps

1. Add and configure a GitHub Action or bot to handle auto-merging for successful Dependabot PRs
2. Ensure all relevant test workflows are enforced before merge (including OpenLDAP test suite)
3. Test the automation to confirm correct merging behavior
4. Document details in the README or repository guidelines

Motivation

Streamlining dependency updates keeps the project secure and up-to-date, with confidence in test coverage via automation.

Notes

Consider using the built-in github-actions bot or third-party options (such as mergify) to implement auto-merge functionality.