fix: 'npm install' not working with PWA release zip file

[shauke]

PR Type

[x] Bugfix

What Is the Current Behavior?

If the PWA 3.1.0 release assets (zip or tar.gz - https://github.com/intershop/intershop-pwa/releases/tag/3.1.0) files are used to start a PWA it fails at the npm install.

This is due to the lazy components schematic needing git and a git repository but it checked only for the git command not for being in a git repository.

$ npm install

> intershop-pwa@3.1.0 postinstall
> npm-run-all --silent build:eslint-rules build:schematics synchronize-lazy-components init-development-environment ngcc

fatal: not a git repository (or any of the parent directories): .git
Command failed: git clean -dnx
fatal: not a git repository (or any of the parent directories): .git

npm ERR! code 1
npm ERR! path D:\intershop-pwa-3.1.0
npm ERR! command failed
npm ERR! command C:\WINDOWS\system32\cmd.exe /d /s /c npm-run-all --silent build:eslint-rules build:schematics synchronize-lazy-components init-development-environment ngcc

npm ERR! A complete log of this run can be found in:

What Is the New Behavior?

Changed the check from git --version to git status to check for both relevant requirements.

Does this PR Introduce a Breaking Change?

[x] No

Other Information

AB#80842