Automate JS Minify Process

[Dresdn]

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To help establish a consistent and, more importantly, a trusted process to minify the static/js contents, this should be 100% automated in a public way. My initial thought would be to use a GitHub Action that auto-minifies and commits when any of the static/js/*.js files change.

When looking at my contribution to [bootstrap5.modal.forms.js](https://github.com/trco/django-bootstrap-modal-forms/blob/master/bootstrap_modal_forms/static/js/bootstrap5.modal.forms.js), I realized I could have put something malicious in, minified it, and there would have been no way for the community to verify the contents of that commit.