Add CI/CD workflow for building multi-approvers JS

Currently, when changes are made to .github/actions/multi-approvers/src/**, one must run `npm run build` to update .github/actions/multi-approvers/dist/index.js. This should be automated.

Look at the existing .github/actions/multi-approvers directory to understand the project structure and npm scripts. The workflow should be added to .github/workflows/, likely triggered on pushes to the src directory. It needs to run `npm run build` and commit the updated dist/index.js file. Check for existing CI/CD examples in the repository to follow patterns.

Escrita pelo modelo de indexação a partir do texto da issue.