A simple NodeJS script to init a git repo with specific gpg credentials and author email for people who have multiple git identities. You need NodeJS and npm to install inquirer first tho.

init.bat

@echo off
node %~dp0\initrepo.js

init.js

const inquirer = require('inquirer')
const path = require('path')
const { execSync } = require('child_process')
const { mkdirSync } = require('fs')

const gpgKeyRegex =
	/sec\s+rsa(2048|4096)\/(?<key>[A-Za-z0-9]+) .+\n .+\n.+(?<email><.+>)/g
const commands = {
	gpgListKeys: 'gpg --list-secret-keys --keyid-format=long',
	init: 'git init',
	setGpgSigningOn: `git config commit.gpgSign true`,
	setRemote: remote => `git remote add origin ${remote}`,
	setUserEmail: email => `git config user.email ${email}`,
	setGpgKey: key => `git config user.signingkey ${key}`
}

console.log('Reading available signing keys')

const gpgKeysOutput = execSync(commands.gpgListKeys).toString()
const matches = gpgKeysOutput.matchAll(gpgKeyRegex)
const gpgKeys = []

for (const match of matches) {
	gpgKeys.push({
		key: match.groups['key'],
		email: match.groups['email']
	})
}

inquirer
	.prompt([
		{
			type: 'input',
			name: 'name',
			message: 'What is the repo name? (in lowercase)'
		},
		{
			type: 'list',
			name: 'user.signingKey',
			message: 'Which gpg key do you want to use with this repo?',
			choices: gpgKeys.map(key => ({
				name: `${key.key} - ${key.email}`,
				value: key.key
			}))
		},
		{
			type: 'list',
			name: 'user.email',
			message: 'What is the author email for this repo?',
			choices: ['example@example.com'] // your git emails
		},
		{
			type: 'input',
			name: 'remote',
			message: 'Is there a remote setup for this repo? If so, what is the link?'
		}
	])
	.then(answers => {
		const directory = answers.name
			? path.resolve(process.cwd(), answers.name)
			: process.cwd()

		if (answers.name) {
			mkdirSync(answers.name)
			process.chdir(directory)
		}

		console.log('Initializing your repo, just a sec!')

		execSync(commands.init)
		execSync(commands.setGpgSigningOn)
		execSync(commands.setUserEmail(answers.user.email))
		execSync(commands.setGpgKey(answers.user.signingKey))

		if (answers.remote) execSync(commands.setRemote(answers.remote))

		console.log('All done. Enjoy! :D')
	})
	.catch(error => {
		if (error.isTtyError) {
			console.log("Prompt couldn't be rendered in the current environment")
		} else {
			console.log(error)
			// Something else went wrong
		}
	})

init.sh

#!/bin/bash

# I'm not sure this works, I'm not a Linux user. 

parent_path=$( cd "$(dirname "${BASH_SOURCE[0]}")" ; pwd -P )

cd "$parent_path"
node ./initrepo.js