[6.x] Load installed starter kit config files into the running app

src/StarterKits/InstallableModule.php

@@ -74,11 +74,28 @@ protected function installFiles(): self
     {
         $this->installableFiles()->each(function ($toPath, $fromPath) {
             $this->installFile($fromPath, $toPath, $this->installer->console());
+            $this->loadInstalledConfig($toPath);
         });
 
         return $this;
     }
 
+    /**
+     * Load installed config file into the running app, so later install steps see it.
+     */
+    private function loadInstalledConfig(string $path): void
+    {
+        $configPath = Path::tidy(config_path()).'/';
+
+        if (! Str::startsWith($path, $configPath) || ! Str::endsWith($path, '.php')) {
+            return;
+        }
+
+        $key = Str::of($path)->after($configPath)->beforeLast('.php')->replace('/', '.')->toString();
+
+        config()->set($key, array_merge(config($key, []), require $path));
+    }
+
     /**
      * Install starter kit module dependencies.
      */

tests/StarterKits/InstallTest.php

@@ -118,6 +118,20 @@ public function it_installs_from_export_paths()
         $this->assertFileHasContent('bobsled_pics', config_path('filesystems.php'));
     }
 
+    #[Test]
+    public function it_loads_installed_config_files_into_the_running_app()
+    {
+        $this->files->put($this->preparePath($this->kitRepoPath('config/statamic/hockey.php')), "<?php\n\nreturn ['rink' => 'calgary'];");
+
+        $this->assertNull(config('filesystems.disks.bobsled_pics'));
+        $this->assertNull(config('statamic.hockey'));
+
+        $this->installCoolRunnings();
+
+        $this->assertEquals('local', config('filesystems.disks.bobsled_pics.driver'));
+        $this->assertEquals('calgary', config('statamic.hockey.rink'));
+    }
+
     #[Test]
     public function it_installs_from_github()
     {