feat(duplicate-issue-detector): add detect-related-issues input to make related issue detection optional

[Copilot]

The duplicate issue detector always reported both exact duplicates and "highly related" issues. This adds an opt-out for the related issues detection, useful for repos that only want strict duplicate flagging.

Changes

• New input detect-related-issues (string, default "true") on gh-aw-duplicate-issue-detector — set to "false" to suppress the "Highly related" section entirely
• Prompt updated — Step 3 evaluation and Step 4 output format both gate on the injected input value; when disabled, only "Clear duplicate" and "Not related" categories are used
• README updated — documents the new input

Usage

jobs:
  run:
    uses: elastic/ai-github-actions/.github/workflows/gh-aw-duplicate-issue-detector.lock.yml@v0
    with:
      detect-related-issues: "false"   # only report exact duplicates
    secrets:
      COPILOT_GITHUB_TOKEN: ${{ secrets.COPILOT_GITHUB_TOKEN }}

Warning

Firewall rules blocked me from connecting to one or more addresses (expand for details)

I tried to connect to the following addresses, but was blocked by firewall rules:

• https://api.github.com/repos/ruby/setup-ruby/git/ref/tags/v1
  • Triggering command: /usr/bin/gh gh api /repos/ruby/setup-ruby/git/ref/tags/v1 --jq .object.sha ux-amd64/src/os/-p 0.1-go1.25.0.lingithub.com/charmbracelet/bubbles/textarea rg/toolchain@v0.-lang=go1.24 credential.helpe/usr/libexec/gcc/x86_64-linux-gnu/13/cc1 (http block)
  • Triggering command: /usr/bin/gh gh api /repos/ruby/setup-ruby/git/ref/tags/v1 --jq .object.sha sonrpc2/conn.go sonrpc2/frame.go ux-amd64/pkg/tool/linux_amd64/compile (http block)

If you need me to access, download, or install something from one of these locations, you can either:

• Configure Actions setup steps to set up my environment, which run before the firewall is enabled
• Add the appropriate URLs or hosts to the custom allowlist in this repository's Copilot coding agent settings (admins only)

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Make detecting related issues optional</issue_title>
<issue_description>In the duplicate issue detector</issue_description>

Comments on the Issue (you are @copilot in this section)

@strawgate /ai make a plan

Custom agent used: default-agent
The default agent

• Fixes Make detecting related issues optional #278

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