Use reusable GHAs from the .github repo

[gab-arrobo]

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[Copilot]

Pull Request Overview

This PR refactors GitHub Actions workflows to use reusable workflows from the .github repository instead of defining job steps locally. The changes consolidate workflow logic into shared, maintainable components.

• Replaced local job definitions with calls to reusable workflows
• Removed the old publish.yml workflow and replaced it with push.yml
• Standardized job configurations to use shared workflows from omec-project/.github

Reviewed Changes

Copilot reviewed 3 out of 3 changed files in this pull request and generated no comments.

File	Description
.github/workflows/push.yml	New workflow file that replaces publish.yml with reusable workflow calls
.github/workflows/publish.yml	Removed entire file containing local job definitions
.github/workflows/main.yml	Refactored to use reusable workflows for doc8, spell-check, link-check, license-check, and fossa-scan jobs

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