Add Dockerfile and app code

This commit adds the Dockerfile and the initial code for the FastAPI application. The Dockerfile sets up the Python 3.11 environment and installs the required dependencies specified in the requirements.txt file. The app.py file contains the basic FastAPI application with a single route that returns a JSON response.

Dockerfile

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+# Read the doc: https://huggingface.co/docs/hub/spaces-sdks-docker
+# you will also find guides on how best to write your Dockerfile
+
+FROM python:3.11
+
+RUN useradd -m -u 1000 user
+USER user
+ENV PATH="/home/user/.local/bin:$PATH"
+
+WORKDIR /app
+
+COPY --chown=user ./requirements.txt requirements.txt
+RUN pip install --no-cache-dir --upgrade -r requirements.txt
+
+COPY --chown=user . /app
+CMD ["uvicorn", "app:app", "--host", "0.0.0.0", "--port", "7860"]

app.py

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+from fastapi import FastAPI
+
+app = FastAPI()
+
+@app.get("/")
+def greet_json():
+    return {"Hello": "World!"}

requirements.txt

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+fastapi
+uvicorn[standard]