Rails 7+ applications do not need a `dockerfile-rails` gem

We have several threads going on here, I’m fine with keeping them together or splitting them out - doesn’t matter to me.

I’m interested in exploring any or all of these, and updating code, guides, or other docs needed to help others with similar needs.

Edit: also possibly related: Generate a .devcontainer folder and its contents when creating a new … · rails/rails@c90a870 · GitHub