Force adding vendor/ to bypass global .gitignore

Author: bocharsky-bw

src/Test/MakerTestEnvironment.php

@@ -299,7 +299,8 @@ private function buildFlexSkeleton(): void
 
         file_put_contents($this->flexPath.'/.gitignore', "var/cache/\n");
 
-        MakerTestProcess::create('git init && git config user.name "symfony" && git config user.email "test@symfony.com" && git add . && git commit -a -m "first commit"',
+        // Force adding vendor/ dir to Git repo in case users exclude it in global .gitignore
+        MakerTestProcess::create('git init && git config user.name "symfony" && git config user.email "test@symfony.com" && git add . && git add vendor/ -f && git commit -a -m "first commit"',
             $this->flexPath
         )->run();
     }