[BUG] Template fails when running `next bundle install`

**Version, Branch, or Commit:**

Main branch

**Expected behavior:**

The generator should complete execution with the app with correct dual booting setup.

**Actual behavior:**

The generator fails when running `next bundle install` with this error:

```
run next bundle install from "."
The git source https://github.com/rails/rails.git is not yet checked out. Please run `bundle install` before trying to start your application
```

**Steps to reproduce:**

Create a new rails app using the template.

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