[misc] Add docs acknowledgement check

[mlsmaycon]

Describe your changes

Issue ticket number and link

Stack

Checklist

• Is it a bug fix
• Is a typo/documentation fix
• Is a feature enhancement
• It is a refactor
• Created tests that fail without the change (if possible)
• Extended the README / documentation, if necessary

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Documentation

Select exactly one:

• I added/updated documentation for this change
• Documentation is not needed for this change (explain why)

Docs PR URL (required if "docs added" is checked)

Paste the PR link from https://github.com/netbirdio/docs here:

https://github.com/netbirdio/docs/pull/____

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud

[Copilot]

Pull Request Overview

This PR adds a GitHub Actions workflow to enforce documentation requirements for pull requests, ensuring contributors acknowledge whether their changes need documentation updates or provide a link to a corresponding docs PR.

• Adds a new GitHub Actions workflow that validates documentation acknowledgement in PR descriptions
• Updates the PR template to include mandatory documentation checkboxes and URL field
• Implements validation logic to ensure exactly one documentation option is selected and verifies docs PR URLs when provided

Reviewed Changes

Copilot reviewed 2 out of 2 changed files in this pull request and generated 2 comments.

File	Description
.github/workflows/docs-ack.yml	New workflow that validates documentation requirements and verifies docs PR links
.github/pull_request_template.md	Added documentation section with checkboxes and URL field for docs PR links

Comments suppressed due to low confidence (1)

.github/workflows/docs-ack.yml:27

• The placeholder URL ends with '__' (double underscore) instead of the more standard '____' (four underscores) used in the workflow validation pattern.

        run: |