setPublicPath(publicPath) {
        webpackConfig.setPublicPath(publicPath);

        return this;
    }
The public version of outputPath: the public path to outputPath.

For example, if "web" is your document root, then:

```
Encore
    .setOutputPath('web/build')
    .setPublicPath('/build')
```

This can also be set to an absolute URL if you're using
a CDN: publicPath is used as the prefix to all asset paths
in the manifest.json file and internally in webpack:

```
Encore
    .setOutputPath('web/build')
    .setPublicPath('https://coolcdn.com')
    // needed when public path is absolute
    .setManifestKeyPrefix('/build')
```

@param {string} publicPath
@returns {Encore}