fix: properly create entrypoint script and test app

Dockerfile

@@ -1,6 +1,6 @@
 FROM ubuntu:22.04
 
-# Force rebuild timestamp: 2024-12-05 20:05
+# Force rebuild timestamp: 2024-12-05 20:20
 LABEL MAINTAINER="jmanhype"
 LABEL Description="Test dockerfile for Hugging Face Space"
 
@@ -36,11 +36,26 @@ RUN git config --global user.email "[email protected]" && \
     git config --global user.name "jmanhype"
 
 # Create a simple test Python app
-RUN echo 'import gradio as gr\n\ndef greet(name):\n    return f"Hello {name}!"\n\ndemo = gr.Interface(fn=greet, inputs="text", outputs="text")\n\nif __name__ == "__main__":\n    demo.launch(server_name="0.0.0.0", server_port=7860)' > $HOME/app/test_app.py
+COPY <<-'EOT' $HOME/app/test_app.py
+import gradio as gr
+
+def greet(name):
+    return f"Hello {name}!"
+
+demo = gr.Interface(fn=greet, inputs="text", outputs="text")
+
+if __name__ == "__main__":
+    demo.launch(server_name="0.0.0.0", server_port=7860)
+EOT
 
 # Create and set up entrypoint script
-RUN echo '#!/bin/bash\necho "Starting Gradio test app..."\npython3 test_app.py' > $HOME/entrypoint.sh && \
-    chmod +x $HOME/entrypoint.sh
+COPY <<-'EOT' $HOME/entrypoint.sh
+#!/bin/bash
+echo "Starting Gradio test app..."
+python3 test_app.py
+EOT
+
+RUN chmod +x $HOME/entrypoint.sh
 
 EXPOSE 7860