optimize the dockerfile with security and shrinking the resulting docker image

Dockerfile

@@ -1,22 +1,29 @@
-FROM python:3.9
+FROM python:3.9-slim-buster
 
-RUN pip install -U pip \
+ENV POETRY_VERSION=1.1.12
+
+RUN useradd --create-home flashbot \
     && apt-get update \
-    && curl -sSL https://raw.githubusercontent.com/python-poetry/poetry/master/get-poetry.py | python -
+    && apt-get install -y --no-install-recommends build-essential libffi-dev libpq-dev gcc procps \
+    && pip install poetry==$POETRY_VERSION \
+    && apt-get clean \
+    && rm -rf /var/lib/apt/lists/*
 
-ENV PATH="${PATH}:/root/.poetry/bin"
+ENV PATH="${PATH}:/home/flashbot/.local/bin"
 
-COPY ./pyproject.toml /app/pyproject.toml
+COPY --chown=flashbot ./pyproject.toml /app/pyproject.toml
-COPY ./poetry.lock /app/poetry.lock
+COPY --chown=flashbot ./poetry.lock /app/poetry.lock
 WORKDIR /app/
 
-RUN poetry config virtualenvs.create false && \
+USER flashbot
-    poetry install
 
-COPY . /app
+RUN poetry config virtualenvs.create false \
+    && poetry install
 
-# easter eggs 😝
+COPY --chown=flashbot . /app
-RUN echo "PS1='🕵️:\[\033[1;36m\]\h \[\033[1;34m\]\W\[\033[0;35m\]\[\033[1;36m\]$ \[\033[0m\]'" >> ~/.bashrc
+
+# easter eggs 
+RUN echo "PS1='️ :\[\033[1;36m\]\h \[\033[1;34m\]\W\[\033[0;35m\]\[\033[1;36m\]$ \[\033[0m\]'" >> ~/.bashrc
 
 ENTRYPOINT [ "poetry" ]
 CMD [ "run", "python", "loop.py" ]