Add Generate A Rails App From The Main Branch as a Rails TIL

rails/generate-a-rails-app-from-the-main-branch.md

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+# Generate A Rails App From The Main Branch
+
+Typically you are going to want to generate a Rails app using some officially
+released version of the framework. These releases have been thoroughly tested,
+have received patches, and can guarantee a certain level of stability.
+
+However, if you are wanting to try out the latest, unreleased features, you may
+want to generate a fresh Rails app based off the current state of the `main`
+branch of the `rails` repository.
+
+To do this, add the `--main` flag:
+
+```bash
+$ rails new rails_app_on_main --main
+```
+
+Toward the top of your app's `Gemfile`, you'll see that `rails` is pointed to
+the `main` branch of their repo:
+
+```ruby
+# Use main development branch of Rails
+gem "rails", github: "rails/rails", branch: "main"
+```
+
+See `rails new --help` for more details
+
+[source](https://x.com/gregmolnar/status/1832720168264286571)