Issue #4 - [OPTIMIZATION] Skip Ruby cache generation when gems unchanged

Description

The Ruby gems cache job runs even when no gem dependencies have changed, wasting CI/CD time. Add logic to skip cache generation when the Gemfile hasn't been modified.

Current Behavior

• Cache job runs on every pipeline
• Unnecessary cache rebuilds
• Slower CI/CD pipelines
• Wasted compute resources

Expected Behavior

• Cache job runs only when gems change
• Faster pipelines when gems unchanged
• Efficient resource usage
• Smart dependency checking

What You'll Learn

• GitLab CI/CD pipeline optimization
• Dependency caching strategies
• YAML pipeline configuration
• Git change detection

Steps to Implement

1. Locate the cache:ruby-gems job in .gitlab-ci.yml
2. Add only:changes: rule to detect Gemfile changes
3. Specify files to watch:
   • Gemfile
   • Gemfile.lock
4. Test that cache runs when gems change
5. Test that cache skips when gems unchanged

Example Configuration

cache:ruby-gems:
  only:
    changes:
      - Gemfile
      - Gemfile.lock

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