feat: add config-name flag

[anshumanv]

Is your feature request related to a problem? Please describe.

Allow passing the config name from the CLI to determine which config to use when there are multiple - https://webpack.js.org/configuration/other-options/#name
It's in v3 but seems to be removed from here for some reason

Describe the solution you'd like
Just need to create a flag and add tests

Describe alternatives you've considered
flag seems the most appropriate

Additional context
@webpack/cli-team do you have any other ideas about this?

[alexander-akait]

I think we already have it for webpack@5, but I think it will be great to webpack@4 too

/cc @snitin315

[anshumanv]

great on it

[snitin315]

Yes, we have it for v5, nice to have it for v4 too.

[snitin315]

I think we should implement this before #1657

[anshumanv]

yeah makes sense to add this first

[anshumanv]

will check it out, this should simply be about passing the the name to compiler or filter the config as per name in the CLI and then pass that config?

[snitin315]

I'm not sure but I think the only difference between this and #1657 should be the support of multiple values?

[snitin315]

@anshumanv webpack --name=web should only set options.name = 'web'. i.e, simply about passing the name to compiler.

[anshumanv]

yeah seems straightforward, will PR today

[anshumanv]

Completed.