Add in a .distignore file

[dkotter]

All Submissions:

• Does your code follow the WooCommerce Sniffs variant of WordPress coding standards?
• Have you written new tests for your changes, as applicable?
• Have you successfully run tests with your changes locally?
• Will this change require new documentation or changes to existing documentation?

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Changes proposed in this Pull Request:

The Action we use to deploy to WordPress.org supports having either a .distignore file or a .gitattributes file. Right now we only have the latter and the issue here is we have a build directory that we exclude from the git repo but we want that in our final release. That isn't possible with a .gitattributes file, only with a .distignore file, so adding that here so we can push out another release with the proper build directory in place.

Steps to test the changes in this Pull Request:

n/a

Changelog entry

Fix - Ensure the final release asset includes the build directory.