fix(angular): add workaround to prevent process from exiting early when building

[leosvelperez]

ISSUES CLOSED: #5729

Current Behavior

When building an Angular app with Nx using the @angular-devkit/build-angular, since version 12.0.1 there's a new implementation for the SASS compilation which uses workers to do the job. The implementation unref the worker early and that causes, in some environments (CI, Docker builds, where no TTY is available), to exit the process too early, and therefore, no compilation occurs. The Angular CLI is working because they rely (intentionally or not) on a setInterval running for analytics while the compilation is occurring, which keeps the event loop busy and prevents the process from exiting.

Expected Behavior

Building an Angular app with Nx should work correctly. A workaround is added (an empty interval) to keep the event loop busy, until the Angular CLI fixes the way workers are managed.

Related Issue(s)

Fixes #5729

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[nx-cloud]

Nx Cloud Report

CI ran the following commands for commit 64f3ed3. Click to see the status, the terminal output, and the build insights.

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Status	Command
	nx affected --target=build --parallel --max-parallel=3
	nx affected --target=e2e
	nx affected --target=lint --parallel --max-parallel=4
	nx affected --target=test --parallel --max-parallel=2

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[github-actions]

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