Add no-topic search mode for testing diverse repositories

[Copilot]

Adds optional no-topic search to index automation files without requiring the hadiscover topic, enabling testing with diverse repositories and controlled result sets for performance validation.

Changes

GitHubService (backend/app/services/github_service.py):

• Added enable_no_topic_search and max_repositories constructor parameters
• Dual search modes: topic-based (default) vs. file path search (automations.yaml in:path)
• Repository limit enforcement with early pagination termination

Configuration propagation:

• Environment variables: ENABLE_NO_TOPIC_SEARCH (default: false), MAX_REPOSITORIES (optional)
• Updated IndexingService, CLI, API routes, and Scheduler to thread parameters through
• Dev docker-compose exposes variables; production docker-compose unchanged

Testing:

• 11 new tests covering both search modes, limit enforcement, environment parsing
• All 86 tests passing

Example usage

# Testing with limited no-topic search
ENABLE_NO_TOPIC_SEARCH=true MAX_REPOSITORIES=10 python -m app.cli index-now

# Production remains unchanged (topic search only)
python -m app.cli index-now

Production behavior unchanged - feature defaults to OFF.

Original prompt

---

This section details on the original issue you should resolve

<issue_title>Add a feature for no-topic search</issue_title>
<issue_description>Add a feature that allows hadiscover to search GitHub for automation files without a topic search. This is useful for testing scenarios to see how many automations can be imported before a certain performance hit on the backend. It also opens up the opportunity to find more bugs as it can search a more diverse repository set in test environments. There should also be a max search limit defined so it's easy with tests to test an X amount of repositories. Tests must be added. It must also be available as an environment variable on the Docker image. On production, we should keep the existing topic search functionality.</issue_description>

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

• Fixes Add a feature for no-topic search #143

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[github-actions]

Dependency Review

✅ No vulnerabilities or license issues or OpenSSF Scorecard issues found.

Scanned Files

None

[codecov]

Codecov Report

❌ Patch coverage is 73.21429% with 15 lines in your changes missing coverage. Please review.
✅ Project coverage is 71.66%. Comparing base (d8f791f) to head (d1c4907).
⚠️ Report is 2 commits behind head on main.
✅ All tests successful. No failed tests found.

Additional details and impacted files

@@            Coverage Diff             @@
##             main     #144      +/-   ##
==========================================
+ Coverage   71.50%   71.66%   +0.16%     
==========================================
  Files          11       11              
  Lines         793      840      +47     
  Branches      124      132       +8     
==========================================
+ Hits          567      602      +35     
- Misses        163      173      +10     
- Partials       63       65       +2     

Flag	Coverage Δ
backend	71.66% <73.21%> (+0.16%)	⬆️

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