Add support for roave/backward-compatibility-check tool

[Copilot]

This PR adds support for the roave/backward-compatibility-check tool, a popular Composer package used to detect backward compatibility breaks in PHP libraries.

Changes Made

1. Tool Configuration

• Added roave-backward-compatibility-check to src/configs/tools.json as a scoped Composer tool
• Configured with proper alias to ensure correct tool naming in generated scripts

2. Documentation Updates

• Added the tool to the tools list in README.md
• Added repository link at the bottom of README.md following the existing pattern

3. Test Coverage

• Added comprehensive test coverage for the new tool in __tests__/tools.test.ts
• Tests cover Darwin, Linux, and Windows platforms
• All existing tests continue to pass

4. Bug Fix

• Fixed the addPackage function to use data['tool'] instead of parts[1] for proper tool naming, ensuring aliases work correctly

Usage

Users can now install roave/backward-compatibility-check using:

- name: Setup PHP with roave/backward-compatibility-check
  uses: shivammathur/setup-php@v2
  with:
    php-version: '8.1'
    tools: roave-backward-compatibility-check

The tool will be installed as a scoped Composer dependency and be available for use in CI workflows to check for backward compatibility breaks.

Testing

• All existing tests pass with 100% code coverage
• New tests verify the tool is correctly configured across all supported platforms
• The tool follows the same patterns as other Composer-based tools in the project

Closes: Request for adding roave/backward-compatibility-check tool support

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[shivammathur]

Please see the review

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 100.00%. Comparing base (011ab6e) to head (f9fbb51).
Report is 5 commits behind head on develop.

Additional details and impacted files

@@            Coverage Diff            @@
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  Coverage   100.00%   100.00%           
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  Files            7         7           
  Lines          805       805           
  Branches       284       285    +1     
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  Hits           805       805           

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[shivammathur]

Rebase it on develop, I changed the base to develop

[Copilot]

Rebase it on develop, I changed the base to develop

Branch has been successfully rebased on develop in commit 1c12093. All changes are preserved and tests are passing.