Configurable environment settings

[gabrielw007]

Which @angular/* package(s) are relevant/related to the feature request?

No response

Description

There is a nice ability in angular to define multiple environments and have a different build per each of them.
The only problem is that environment file is NOT configurable on prod but there are settings need that ability for us,
for example: "serverApiUrl" which we need to be configurable on prod.

So, in addition to what we have today, we need an ability to define configurable settings according to the environment used.

Proposed solution

various options i can think about:

• enable defining configurable properties in environment files
• enable creating a config file per environment and using it in code like environment with file replace in angular.json like environment

Alternatives considered

currently we can create a "configFile" property in all environments, but all those files are assets, so all of them are deployed during CI\CD although a specific environment has been built.

[alan-agius4]

Duplicate of #4318

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