Improve error message when no committer configuration is available

[josecelano]

I've found a hidden "bug" (or not friendly error) after refactoring the test workflow. You need to setup the git committer identity before using the action. You can do it for example with:

git config --global user.name 'github-actions[bot]'
git config --global user.email 'github-actions[bot]@users.noreply.github.com'

if you want to use the GitHub Bot.

The error was hidden because in my local machine I have it and in the previous workflow we were using this action which set up the global user config (git_config_global: true):

- name: Import GPG key
  id: import-gpg
  uses: crazy-max/ghaction-import-gpg@v4
  with:
    gpg_private_key: ${{ secrets.GPG_PRIVATE_KEY }}
    passphrase: ${{ secrets.PASSPHRASE }}
    git_config_global: true
    git_user_signingkey: true
    git_commit_gpgsign: false
    fingerprint: 'BD98B3F42545FF93EFF55F7F3F39AA1432CA6AD7'

I think the action should fail if it does not find that configuration, at least for the commands that generate a commit.

what do you think @da2ce7 , @yeraydavidrodriguez ? This is the factory class from SimpleGit.

Originally posted by @josecelano in #19 (comment)

[josecelano]

How to reproduce the error using only Git:

1. Remove user and email from your global git config:

$ cat ~/.gitconfig 
[user]
	name = Your Name
	email = your@email.com

2. Try to commit changes to a new repo with:

cd /tmp && mkdir test-identity && cd test-identity/
git init
touch a.txt
git add -A
git commit -m "add a.txt"

You will see an error like this:

Author identity unknown

*** 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: unable to auto-detect email address (got 'xxx@xxx.(none)')

[josecelano]

Finally, we did not implement this feature because the action is showing the original Git error message which is enough. When I created the issue I thought it was being hidden.

I've just created a PR to confirm that the action shows the original Git error message.

You can see the error here: https://github.com/Nautilus-Cyberneering/git-queue/runs/6472678051?check_suite_focus=true#step:5:11