Adds suggested working Docker

Dockerfile

@@ -1,8 +1,24 @@
 FROM python:3.8.9
-COPY . /app
+
 WORKDIR /app
-RUN apt-get update && xargs -r -a packages.txt apt-get install -y && rm -rf /var/lib/apt/lists/*
-RUN pip3 install --no-cache-dir -r requirements.txt
+
+COPY ./requirements.txt /app/requirements.txt
+COPY ./packages.txt /app/packages.txt
+
+RUN apt-get update && xargs -r -a /app/packages.txt apt-get install -y && rm -rf /var/lib/apt/lists/*
+RUN pip3 install --no-cache-dir -r /app/requirements.txt
 RUN pip3 install --no-cache-dir streamlit==1.10.0 
+
+# User
+RUN useradd -m -u 1000 user
+USER user
+ENV HOME /home/user
+ENV PATH $HOME/.local/bin:$PATH
+
+WORKDIR $HOME
+RUN mkdir app
+WORKDIR $HOME/app
+COPY . $HOME/app
+
 EXPOSE 8501
 CMD streamlit run app.py