Update app.py

Add path to weights as environmental variable

app.py

@@ -1,5 +1,5 @@
 import spaces
-
+import os
 import tempfile
 from pathlib import Path
 
@@ -141,5 +141,6 @@ with gr.Blocks(css=css, title="MRSegmentator") as iface:
 
 
 if __name__ == "__main__":
+    os.environ["MRSEG_WEIGHTS_PATH"] = "weights_v1.2"
     iface.queue()
     iface.launch()