gatsby: gatsby new fails if there's no git identity set

Description

gatsby new fails if there’s no git identity set.

I don’t set my email in ~/.gitconfig on purpose, as then I am asked to set it on the 1st commit for every new local clone (with git config --global user.useConfigOnly true). I need to use different email addresses for different projects and I always forget to set it correctly unless I don’t set my email globally.

I would love it if there were a way to skip the git commit part of setting up a new project.

Steps to reproduce

Unset your git identity (open ~/.gitconfig, remove email line in section [user], in the same section add line useConfigOnly = true, and then run e.g. gatsby new hello-world https://github.com/gatsbyjs/gatsby-starter-hello-world.

Expected result

Set up a gatsby project.

Actual result

% gatsby new gatsby-starter https://github.com/gatsbyjs/gatsby-starter-hello-world
info Creating new site from git: https://github.com/gatsbyjs/gatsby-starter-hello-world.git

Cloning into 'gatsby-starter'...
remote: Enumerating objects: 43, done.
remote: Counting objects: 100% (43/43), done.
remote: Compressing objects: 100% (27/27), done.
remote: Total 1159 (delta 29), reused 29 (delta 16), pack-reused 1116
Receiving objects: 100% (1159/1159), 3.69 MiB | 1.82 MiB/s, done.
success Created starter directory layout
info Installing packages...

yarn install v1.17.3
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
info fsevents@2.0.7: The platform "linux" is incompatible with this module.
info "fsevents@2.0.7" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.9: The platform "linux" is incompatible with this module.
info "fsevents@1.2.9" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] 🔗  Linking dependencies...
warning "gatsby > eslint-config-react-app@4.0.1" has incorrect peer dependency "eslint-plugin-flowtype@2.x".
warning "gatsby > @typescript-eslint/eslint-plugin > tsutils@3.17.1" has unmet peer dependency "typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta".
[4/4] 🔨  Building fresh packages...
info Initialising git in gatsby-starter

info Create initial git commit in gatsby-starter

9.93s user 2.95s system 103% cpu 12.462s total
 INSERT  zeorin  ~  code  gatsby new hello-world https://github.com/gatsbyjs/gatsby-starter-hello-world
info Creating new site from git: https://github.com/gatsbyjs/gatsby-starter-hello-world.git

Cloning into 'hello-world'...
remote: Enumerating objects: 43, done.
remote: Counting objects: 100% (43/43), done.
remote: Compressing objects: 100% (27/27), done.
remote: Total 1159 (delta 29), reused 29 (delta 16), pack-reused 1116
Receiving objects: 100% (1159/1159), 3.69 MiB | 1.64 MiB/s, done.
success Created starter directory layout
info Installing packages...

yarn install v1.17.3
[1/4] 🔍  Resolving packages...
[2/4] 🚚  Fetching packages...
info fsevents@2.0.7: The platform "linux" is incompatible with this module.
info "fsevents@2.0.7" is an optional dependency and failed compatibility check. Excluding it from installation.
info fsevents@1.2.9: The platform "linux" is incompatible with this module.
info "fsevents@1.2.9" is an optional dependency and failed compatibility check. Excluding it from installation.
[3/4] 🔗  Linking dependencies...
warning "gatsby > eslint-config-react-app@4.0.1" has incorrect peer dependency "eslint-plugin-flowtype@2.x".
warning "gatsby > @typescript-eslint/eslint-plugin > tsutils@3.17.1" has unmet peer dependency "typescript@>=2.8.0 || >= 3.2.0-dev || >= 3.3.0-dev || >= 3.4.0-dev || >= 3.5.0-dev || >= 3.6.0-dev || >= 3.6.0-beta || >= 3.7.0-dev || >= 3.7.0-beta".
[4/4] 🔨  Building fresh packages...
info Initialising git in hello-world

info Create initial git commit in hello-world


*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.


 ERROR

Command failed: git commit -m "Initial commit from gatsby: (https://github.com/gatsbyjs/gatsby-starter-hello-world.git)"

*** Please tell me who you are.

Run

  git config --global user.email "you@example.com"
  git config --global user.name "Your Name"

to set your account's default identity.
Omit --global to set the identity only in this repository.

fatal: no email was given and auto-detection is disabled




  Error: Command failed: git commit -m "Initial commit from gatsby: (https://github.com/gatsbyjs/gatsby-starter-hello-wo  rld.git)"
  *** Please tell me who you are.
  Run
    git config --global user.email "you@example.com"
    git config --global user.name "Your Name"
  to set your account's default identity.
  Omit --global to set the identity only in this repository.
  fatal: no email was given and auto-detection is disabled

  - init-starter.js:151
    [lib]/[gatsby-cli]/lib/init-starter.js:151:5

  - Generator.next

  - task_queues.js:93 processTicksAndRejections
    internal/process/task_queues.js:93:5

Environment

  System:
    OS: Linux 5.0 Ubuntu 19.04 (Disco Dingo)
    CPU: (8) x64 Intel(R) Core(TM) i7-8550U CPU @ 1.80GHz
    Shell: 5.5.1 - /bin/zsh
  Binaries:
    Node: 12.10.0 - /usr/bin/node
    Yarn: 1.17.3 - /usr/bin/yarn
    npm: 6.10.3 - /usr/bin/npm
  Languages:
    Python: 2.7.16 - /usr/bin/python
  Browsers:
    Chrome: 77.0.3865.90
    Firefox: 69.0
  npmGlobalPackages:
    gatsby-cli: 2.7.49