{
    "name": "bk2k/demo-package",
    "type": "typo3-cms-extension",
    "description": "Bootstrap Package Extension / Overwrite Tests",
    "homepage": "https://www.bootstrap-package.com",
    "license": ["GPL-2.0-or-later"],
    "keywords": ["TYPO3 CMS"],
    "require": {
        "bk2k/bootstrap-package": "*"
    },
    "autoload": {
        "psr-4": {
            "Bk2k\\DemoPackage\\": "Classes/"
        }
    }
}

{
    "name": "bk2k/demo-package",
    "type": "typo3-cms-extension",
    "description": "Bootstrap Package Extension / Overwrite Tests",
    "homepage": "https://www.bootstrap-package.com",
    "license": ["GPL-2.0-or-later"],
    "keywords": ["TYPO3 CMS"],
    "require": {
        "bk2k/bootstrap-package": "*"
    },
    "autoload": {
        "psr-4": {
            "Bk2k\\DemoPackage\\": "Classes/"
        }
    },
    "extra": {
        "typo3/cms": {
            "extension-key": "demo_package"
        }
    }
}

Add extension-key to demo package
[TASK] Add extension-key to demo package
