[WIP] Fix CI triggering twice on PR and push

[Copilot]

• Understand the current CI workflow configuration
• Identify the root cause of duplicate CI runs (both push and pull_request triggers)
• Update ci_pipeline.yml to prevent duplicate runs by:
  • Keep pull_request trigger for all PRs
  • Limit push trigger to master branch only
• Document the changes in the CI documentation
• Verify the fix works as expected

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