fix(actions): add 3.x branch support for isolated tests and subsplit

Author: xHeaven

bin/build-changed-packages

@@ -5,40 +5,46 @@
  * Though this script attempts to simplify, it borrows heavily from Symfony's approach.
  *
  * @see https://github.com/symfony/symfony/blob/7.2/.github/build-packages.php
- *
- * TODO: This script is not really optimized, because it runs on every unit test action.
  */
 
-$tempestPackages = json_decode(
-    json: exec(__DIR__  . '/get-packages'),
-    associative: true
-);
+$output = shell_exec(__DIR__ . '/get-packages');
+$tempestPackages = json_decode($output, associative: true);
+
+// Determine the dev version from inter-package dependencies.
+// This ensures we bundle packages with the same version that deps expect.
+$devVersion = 'dev-main';
+
+foreach ($tempestPackages as $package) {
+    $composerPath = sprintf('%s/composer.json', $package['directory']);
+    $composerFile = json_decode(file_get_contents($composerPath), true);
+
+    foreach ($composerFile['require'] ?? [] as $dep => $version) {
+        if (str_starts_with($dep, 'tempest/') && str_starts_with($version, 'dev-')) {
+            $devVersion = $version;
+            break 2;
+        }
+    }
+}
 
 $composerPackages = [
     'packages' => [],
 ];
 
 foreach ($tempestPackages as $package) {
-    // Find out if there are changes in this package.
-    $diff = exec(sprintf('git diff --name-only HEAD^ -- %s', $package['directory']));
-
     $composerPath = sprintf('%s/composer.json', $package['directory']);
     $composerFile = json_decode(file_get_contents($composerPath), true);
 
-    // If there are changes, bundle the package and
-    // add it to our root packages.json file.
-    if (empty($diff) === false) {
-        // Bundle the current package as a tar file.
-        passthru(sprintf("cd %s && tar -cf package.tar --exclude='package.tar' *", $package['directory']));
+    // Bundle ALL packages as tar files to ensure consistent versions.
+    // This ensures all inter-package dependencies (e.g., dev-3.x) can be
+    // resolved from the local repository.
+    passthru(sprintf("cd %s && tar -cf package.tar --exclude='package.tar' *", $package['directory']));
 
-        // TODO: Update the package version.
-        $composerFile['version'] = 'dev-main';
-        $composerFile['dist']['type'] = 'tar';
-        $composerFile['dist']['url'] = 'file://'. $package['directory'] . '/package.tar';
+    $composerFile['version'] = $devVersion;
+    $composerFile['dist']['type'] = 'tar';
+    $composerFile['dist']['url'] = 'file://'. $package['directory'] . '/package.tar';
 
-        // Add the package details to the root "packages.json."
-        $composerPackages['packages'][$composerFile['name']][$composerFile['version']] = $composerFile;
-    }
+    // Add the package details to the root "packages.json."
+    $composerPackages['packages'][$composerFile['name']][$composerFile['version']] = $composerFile;
 
     // Load the packages from the root "packages.json" file we will write in a second.
     $composerFile['repositories'] = [