add pixi check and install

app.py

@@ -1,7 +1,21 @@
 import gradio as gr
+import subprocess
+from pathlib import Path
+PIXI_PATH = Path("/home/user/.pixi/bin/pixi")
 
-def greet(name):
-    return "Hello " + name + "!!"
+def check_and_install_pixi():
+    try:
+        subprocess.check_call("pixi --version", shell=True)
+    except subprocess.CalledProcessError:
+        print("pixi not found. Installing pixi...")
+        # Install pixi using the provided installation script
+        subprocess.check_call("curl -fsSL https://pixi.sh/install.sh | bash", shell=True)
 
-demo = gr.Interface(fn=greet, inputs="text", outputs="text")
-demo.launch()
+if __name__ == "__main__":
+    check_and_install_pixi()
+    
+    def greet(name):
+        return "Hello " + name + "!!"
+
+    demo = gr.Interface(fn=greet, inputs="text", outputs="text")
+    demo.launch()