made flask server able to read markdown files for posts

Dockerfile

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+# syntax=docker/dockerfile:1
+
+FROM python:3.12.2-slim-bookworm
+
+RUN apt-get update && apt-get upgrade -y
+
+RUN useradd -m app
+
+USER app
+
+COPY . .
+
+RUN python3 -m pip install --upgrade pip
+RUN python3 -m pip install -r requirements.txt
+
+WORKDIR ./app
+
+CMD ["python3", "-u", "./app.py"]