Extend projects in Angular CLI workspace file (angular.json)

[MickL]

Bug Report or Feature Request

- [ ] bug report -> please search issues before submitting
- [X] feature request

Area

- [ ] devkit
- [X] schematics

Goal

Having one app that can be built with different styles/assets for multiple customers.

Current functionality

This works out very nice with in the angular.json in the projects object:

...
"projects": {
    "customer1": {
        ...
    }
    "customer2": {
        ...
    }
}
...

And then ng build customer1 and ng build customer2.

Anyway this creates tons of duplicate code. What if we have 20 customers(-> projects) and then decide to change just a single value, e.g. adding one more file to scripts array?

Desired functionality

Having one big-ass default project, extend it and just overwrite the values that need to be overwritten:

...
"projects": {
    "customer1": {
        ... outputPath, index, main, polyfills, tsConfig, styles, scripts, etc. etc. ...
       "assets": [
              "src/theme/customer1/assets"
       ],
       ...
    }
    "customer2": {
        "extends": "customer1",
         "assets": [
              "src/theme/customer1/assets"
       ]
    }
}
...

[MickL]

Closing as a duplicate of #11233

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