Permit ignore some files

[Roriz]

Motivation

In my current project we use rollbar-sourcemap-webpack-plugin, this plugin generate and upload .js.map files on build process. All .js.map files is recommended to no be public:

I believe this is a common pattern and other projects should have the same problem

Workaround

For now before of npm run deploy we running rm -R dist/js/*.map but I believe this should be the responsibility of the deploy tool.

Solution

Add another optional config (ignoreMatch) to permit ignore some files based on Globbing patterns.
I think this config should be as default something like !**/*.map, but to not generate break change, suggest the default as an empty string for now.

[nicekiwi]

Globby matches are supported in 4.0 but gave not been released yet. Although the regex match there currently should let you exclude some files.

[adam-gipril]

This could also be done by allowing assetMatch to be an array (I just did it like that locally before I had seen this PR).

Suggested change

	assetMatch: Joi.string().default('**'),
	ignoreMatch: Joi.string().default(''),
	assetMatch: [Joi.string().default('**'), Joi.array().items(Joi.string())],

@nicekiwi looks like even at the current package.json globby version of 8.0.1, the globby.sync method can accept an array of patterns. I tested the change I've suggested locally, and it works with the following to upload all but my map files. Any estimate on when something like this could be merged and released?

pluginOptions: {
  s3Deploy: { 
    assetMatch: ['**', '!(**/*.map)'],
  }
}