Allow specifying custom NGCC lockfile location (cannot build in parallel with Ivy)

🚀 feature request

Relevant Package

This feature request is for @angular/compiler-cli

Description

I am running multiple webpack build pipelines simultaneously in CI. It does work without Ivy, but with Ivy (Angular 9 rc 11) it fails with:

(If you are sure no ngcc process is running then you should delete the lockfile at /drone/src/github.com/Rush/angular-app/node_modules/@angular/compiler-cli/ngcc/__ngcc_lock_file__.)

Describe the solution you’d like

This line should allow overwriting the lock file location: https://github.com/angular/angular/blob/d15cf60c4969c4da081d0efdbc818abfd3fe43eb/packages/compiler-cli/ngcc/src/execution/lock_file.ts#L20 Perhaps like so:

 lockFilePath = process.env.ANGULAR_NGCC_LOCK_FILE_PATH || 
      this.fs.resolve(require.resolve('@angular/compiler-cli/ngcc'), '../__ngcc_lock_file__');

I think this is safe cause all simultaneous compiles are happening in Webpack so they’re not conflicting with each other. @petebacondarwin @AndrewKushnir

Not having this would cause my builds running 10x more slowly due to a lot of parallelism.

Describe alternatives you’ve considered

Disabling the lock file with a config option.

[petebacondarwin]

Working on a fix (b)

[angular-automatic-lock-bot[bot]]

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