App: pin to a specific LTX-2 commit.

This commit pins LTX-2 to before the changes to the model ledger that do not exist anymore.

app.py

@@ -12,10 +12,16 @@ subprocess.run([sys.executable, "-m", "pip", "install", "xformers==0.0.32.post2"
 # Clone LTX-2 repo and install packages
 LTX_REPO_URL = "https://github.com/Lightricks/LTX-2.git"
 LTX_REPO_DIR = os.path.join(os.path.dirname(os.path.abspath(__file__)), "LTX-2")
+LTX_COMMIT_SHA = "ae855f8538843825f9015a419cf4ba5edaf5eec2"
 
 if not os.path.exists(LTX_REPO_DIR):
     print(f"Cloning {LTX_REPO_URL}...")
-    subprocess.run(["git", "clone", "--depth", "1", LTX_REPO_URL, LTX_REPO_DIR], check=True)
+    os.makedirs(LTX_REPO_DIR)
+    subprocess.run(["git", "init", LTX_REPO_DIR], check=True)
+    subprocess.run(["git", "remote", "add", "origin", LTX_REPO_URL], cwd=LTX_REPO_DIR, check=True)
+    subprocess.run(["git", "fetch", "--depth", "1", "origin", COMMIT_SHA], cwd=LTX_REPO_DIR, check=True)
+    subprocess.run(["git", "checkout", LTX_COMMIT_SHA], cwd=LTX_REPO_DIR, check=True)
+
 
 print("Installing ltx-core and ltx-pipelines from cloned repo...")
 subprocess.run(