Support for the entrypoints.json with multiple webpack config

[stof]

If webpack is used in multi-config mode (thanks to Encore.reset()), we would need to make the name of entrypoints.json to be configurable, so that each config can create its own file, without overriding the entrypoints created by the other config (and we will also need to add support for that in the WebpackEncoreBundle of course).

[stof]

hmm, actually, keeping it named entrypoints.json might be fine if we take care of using separate subfolders as output path for each config (which might be necessary to avoid conflicts between chunk files too)

[Alymbek]

hi, @stof!

I just try to make separate folders to output path, but get only single entrypoints.json and manifest.json for all of them.
and that files are incorrect, see #477

[seyfer]

It is supported with webpack encore bundle
I guess closed by this one
symfony/webpack-encore-bundle#17

[Lyrkan]

Yep, closing this since a new version of the WebpackEncoreBundle has been released with that feature :)