html file replacement doesn't work

🐞 Bug report

Command (mark with an x)

- [ ] new
- [x] build
- [ ] serve
- [ ] test
- [ ] e2e
- [ ] generate
- [ ] add
- [ ] update
- [ ] lint
- [ ] xi18n
- [ ] run
- [ ] config
- [ ] help
- [ ] version
- [ ] doc

Description

After upgrading to Angular 8 file replacement stopped working for html files.

🔬 Minimal Reproduction

https://github.com/diogen737/fileReplacement-test

Expexted behavior

since there’s html replacement config in angular.json after ng build --prod I expect to see
“this is prod index” on top of the page (localhost:8080/tester) which is present in index.prod.html and absent in index.html from which I conclude that html filre replacement is not working anymore.

🌍 Your Environment

Angular CLI: 8.0.0
Node: 12.3.1
OS: linux x64
Angular: 8.0.0
... animations, cli, common, compiler, compiler-cli, core, forms
... language-service, platform-browser, platform-browser-dynamic
... router

Package                           Version
-----------------------------------------------------------
@angular-devkit/architect         0.800.0
@angular-devkit/build-angular     0.800.0
@angular-devkit/build-optimizer   0.800.0
@angular-devkit/build-webpack     0.800.0
@angular-devkit/core              8.0.0
@angular-devkit/schematics        8.0.0
@ngtools/webpack                  8.0.0
@schematics/angular               8.0.0
@schematics/update                0.800.0
rxjs                              6.4.0
typescript                        3.4.5
webpack                           4.30.0

[dottodot]

@alan-agius4 This really should have been mentioned as a breaking change in the release information

[alan-agius4]

@clydin implemented https://github.com/angular/angular-cli/pull/15010 which offers more control over the index html and is available in the 8.2 beta version.

Apologies for any inconvenience caused.