Hi Max.
This is a barebones template of a Vue on Rails application, using Rails 6.x, Vue 3.x, Ruby 3.x, and Webpacker 5.x.
(this requires yarn, so install it if necessary)
bin/setup
in one tab:
rails server
then in another tab:
./bin/webpack-dev-server
You will be greeted with a Vue page saying "Hello World"
From there you are free to build your new Vue on Rails application to your specific needs.
The webpack has been configured to recgonize *.vue files.
Vue components can be added to the app/javascript/src/components file, just make sure to update the router.