service-worker.js loading is Unconventional

[rcmurphy]

service-worker.js is in the templates directory, which would lead one to believe that they can override it. However, the file is actually loaded in directly as a plain file. Would you be open to a PR to change the behavior to use template based loading? With caching, the performance difference would be non-existent after the first request, and it would allow for some more powerful customization of the logic within that file.

[PetrDlouhy]

I have easily overridden this by adding

    path('serviceworker.js', TemplateView.as_view(template_name='serviceworker.js', content_type='application/javascript'), name='service-worker'),

to my urls.py (before django-pwa).

But some kind of support from django-pwa would be nice, since it would be common request to generate some of the filesToCache automatically.
Having it in template with reasonable blocks defined or having it configurable some other way would also spare us a lot of code copying and duplication.