add initial Dockerfile, main application, and requirements for FastAPI summarization service

Dockerfile

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+FROM python:3.9
+
+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", "main:app", "--host", "0.0.0.0", "--port", "7860"]

main.py

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+from fastapi import FastAPI
+from pydantic import BaseModel
+from transformers import pipeline
+
+app = FastAPI()
+summarizer = pipeline("summarization", model="facebook/bart-large-cnn")
+
+
+class TextInput(BaseModel):
+    text: str
+
+@app.post("/summarize")
+async def summarize_text(input: TextInput):
+    summary = (summarizer(input.text, max_length=130, min_length=30, do_sample=False))
+    return summary

requirements.txt

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+fastapi
+transformers
+uvicorn
+