backstage: npx @backstage/create-app causes error: "Could not execute command git config user.name"

Expected Behavior

The ‘Getting Started’ guide works https://backstage.io/docs/getting-started/

Actual Behavior

The ‘Getting Started’ guide does not work https://backstage.io/docs/getting-started/

Steps to Reproduce

1. I create a new directory

2. I run npx @backstage/create-app

3. I enter a name for the app

4. I get an error Error: Failed to read git config, Error: Could not execute command git config user.name

   npx @backstage/create-app
   Need to install the following packages:
     @backstage/create-app@0.4.32
   Ok to proceed? (y) y
   ? Enter a name for the app [required] my-backstage
   
   Creating the app...
   
   Error: Failed to read git config, Error: Could not execute command git config user.name
   
   It seems that something went wrong when creating the app 🤔
   
   🔥  Failed to create app!
   

I then tried to initialise a git repo myself with git init, but this did not have any effect.

When I run git config --list, I can see user.name

Context

It looks like the same happens in the GitHub Action https://github.com/backstage/backstage/actions/runs/3273459460/jobs/5385687308#step:9:19

This might be related to #13585?

Your Environment

• Browser Information: n/a

• Output of yarn backstage-cli info:

  yarn run v1.22.19
  error Couldn't find a package.json file in ".../backstage"
  info Visit https://yarnpkg.com/en/docs/cli/run for documentation about this command.