Setup CI plugin builder
Right now, every time we roll a release of Printception I have to manually include the Simple Settings library files. This works for all of our internal stuff that's not released through WP.org and/or is hosted internally, but @Fahn3246 is hosting our current test site through a provider who doesn't give us `git` access, let alone `composer`. I added a way of conditionally building plugins during CI for Simple Settings itself to force rebuilding the demo plugin every time a new tag is published. Let's port that to roll zip files for Printception with Simple Settings bundled automatically any time we publish a new tag. With the quirky dev workflow we're employing on this project, it might be a good idea to also include a way to force rebuilding based on the commit message or similar.
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