Create Dockerfile

Dockerfile

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+FROM python:3.9-slim
+
+WORKDIR /code
+
+COPY requirements.txt /code/requirements.txt
+COPY app.py /code/app.py
+COPY credentials.json /code/credentials.json
+
+RUN pip install --no-cache-dir --upgrade -r /code/requirements.txt
+
+CMD ["python", "app.py"]