Create Dockerfile

Dockerfile

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+# using ubuntu LTS version
+FROM ubuntu:20.04 AS builder-image
+
+# avoid stuck build due to user prompt
+ARG DEBIAN_FRONTEND=noninteractive
+
+RUN apt-get update && apt-get install --no-install-recommends -y python3.9 python3.9-dev python3.9-venv python3-pip python3-wheel build-essential && \
+	apt-get clean && rm -rf /var/lib/apt/lists/*
+
+# create and activate virtual environment
+# using final folder name to avoid path issues with packages
+RUN python3.9 -m venv /home/myuser/venv
+ENV PATH="/home/myuser/venv/bin:$PATH"
+
+# install requirements
+COPY requirements.txt .
+RUN pip3 install --no-cache-dir wheel
+RUN pip3 install --no-cache-dir -r requirements.txt
+
+FROM ubuntu:20.04 AS runner-image
+RUN apt-get update && apt-get install --no-install-recommends -y python3.9 python3-venv && \
+	apt-get clean && rm -rf /var/lib/apt/lists/*
+
+RUN useradd --create-home myuser
+COPY --from=builder-image /home/myuser/venv /home/myuser/venv
+
+USER myuser
+RUN mkdir /home/myuser/code
+WORKDIR /home/myuser/code
+COPY . .
+
+EXPOSE 5000
+
+# make sure all messages always reach console
+ENV PYTHONUNBUFFERED=1
+
+# activate virtual environment
+ENV VIRTUAL_ENV=/home/myuser/venv
+ENV PATH="/home/myuser/venv/bin:$PATH"