FIX: keep package-source in git so a clone can composer install

CHANGELOG.md

@@ -11,6 +11,9 @@ and this project adheres to [Semantic Versioning](https://semver.org/spec/v2.0.0
 - **`mage new gitignore` command:** New command that adds a Magento aware `.gitignore` to the project. The templates are synced on first use to `~/.config/mage/templates`, so they stay available offline and refresh themselves after 30 days.
 - **`mage setup`:** Now adds the same `.gitignore`, existing files are left untouched.
 
+### Fixed
+- **Cloning a project created by `mage`:** `package-source` now gets a `.gitkeep`, so the folder survives a clone. Without it `composer install` aborts with "the url supplied for the path (package-source/*/*) repository does not exist".
+
 ### Changed
 - **`mage new theme` and `mage new module`:** The generated files now come from the `templates/theme` and `templates/module` folders instead of being built as strings in the script, so files can be added or removed without a rebuild. Both now also get a `composer.json`, a `README.md`, a `CHANGELOG.md`, a `SECURITY.md`, an `.editorconfig` and a `.gitignore`, and the generated `theme.xml` starts with an XML declaration.
 - **`mage new module`:** The module template now follows the [hyva-module-template](https://github.com/GrimLink/hyva-module-template). It asks whether this is a Hyvä module, defaulting to what the project has installed. A Hyvä module additionally gets the config observer, its `events.xml` and the tailwind sources, and sequences `Hyva_Theme` instead of `Magento_Theme`.

src/_install.sh

@@ -75,6 +75,9 @@ function mage_install() {
 
   echo "Setting up local composer folder"
   mkdir -p package-source
+  # Git cannot track an empty directory, so without a marker a fresh clone has
+  # no package-source and composer install aborts on the path repository.
+  touch package-source/.gitkeep
   $COMPOSER_CLI config repositories.local-packages path "package-source/*/*"
 
   echo "Setting up default plugins"