Related to 8816-gh-Automattic/dotcom-forge.

Proposed Changes

• The original issue needs to be fixed in Emscripten. There's already a PR to address it but it will take time until the changes will be incorporated in the app, as we'll need to wait for new Emscripten and Playground versions.
• In the meantime, we'll create an internal plugin that will override the default umask value. Note that this plugin is located in a special folder managed by Playground for platform-level-specific plugins.
• As a temporary workaround, we'll override the default umask value by pretending a PHP file using the auto_prepend_file PHP directive.

Testing Instructions

Create files with test file

• Run the app with the command npm start.
• Create a new site or select one already created.
• Create the file test.php, at the root level on the site, with the following content:

<?php
// Create file with default umask
$filename = "example-default-umask.txt";
$current_umask = umask();
    echo sprintf("Current umask: %04o<br>", $current_umask);
    $content = 'This is the content of the file.';
if (file_exists($filename)) {
    unlink($filename);
}
if (file_put_contents($filename, $content) !== false) {
    echo "File '$filename' created successfully.<br>";
} else {
    echo "Error creating file '$filename'.<br>";
}
chmod($filename, 0777 - umask());

• Start the site.
• Navigate to the PHP file: http://localhost:<PORT>/test.php.
• Observe the umask value shown on the page is 0022.
• Navigate to the site folder.
• Observe that the permissions of the file are rwxr-xr-x (Full access to owner, and only READ and EXECUTE permissions to group and others).

Addresses #269

• Start the app with command npm start.
• Create a new site.
• Change the PHP version to 8.2.
• Click on the Terminal button.
• In the terminal:
  • Run cd wp-content/themes.
  • Run git clone https://github.com/DevArge/sage-vite.git.
  • Run cd sage-vite.
  • Run yarn install && composer install && yarn build.
• Back in the Studio app, start the site.
• Navigate to WP-Admin dashboard.
• Navigate to Appearance -> Themes.
• Activate the Sage Vite theme.
• Observe that no errors are thrown and the site is working as expected.

Pre-merge Checklist

• Have you checked for TypeScript, React or other console errors?