cloudfrontInvalidateOptions not compatible with s3options.credentials

[davidstelter]

node version: v12.13.0
webpack-s3-plugin version: 1.0.3
os: macos Mojave

Receiving following error on build:

Missing credentials in config, if using AWS_CONFIG_FILE, set AWS_SDK_LOAD_CONFIG=1

The s3options section supports providing credentials like this:

  s3Options: {
      credentials: new AWS.SharedIniFileCredentials({profile: 'my-profile'})
    },

This works for the S3 calls, but produces an error after the S3 upload if cloudfrontInvalidateOptions is present.

From looking at the source it's clear why, the s3Options.credentials value is simply not considered as a credentials source:

    if (cloudfrontInvalidateOptions.DistributionId) {
      const {accessKeyId, secretAccessKey, sessionToken} = clientConfig.s3Options
      const cloudfront = new CloudFront({accessKeyId, secretAccessKey, sessionToken})

Presumably CloudFront can also use the s3Options.credentials source, if not the documentation should be updated to indicate this.