On push add GitHub Actions "build" & "test"

[magnasilvar]

Relevant Package

This feature request is for global @angular-stdlib.

Is your feature request related to a problem? Please describe.

No.

Describe the solution you'd like

On push add new GitHub Action :

• build : npm run build
• test : npm run test

Platforms concerned :

• ubuntu-latest
• macos-latest
• windows-latest.

• To build and test all projects, we have to use Nx (https://nx.dev/angular) which is an extensible dev tools for monorepos.
• Add GitHub Workflow Status badge to angular-stdlib/README (ex: https://shields.io/category/build)
• Adapt CONTIBUTING.md - Submitting a Pull Request (PR)

Resource Links :

• https://github.com/features/actions
• https://github.com/actions/runner
• https://github.com/actions/virtual-environments
• https://github.com/actions/typescript-action
• https://nx.dev/angular/getting-started/nx-and-cli
• https://help.github.com/en/actions/automating-your-workflow-with-github-actions/configuring-a-workflow#adding-a-workflow-status-badge-to-your-repository