build: fix backend dockerfile

Dockerfile

@@ -4,28 +4,27 @@ RUN useradd -m -u 1000 user
 USER user
 ENV HOME=/home/user \
     POETRY_HOME=/opt/poetry \
+    POETRY_CACHE_DIR=/tmp/poetry_cache \
     PATH="/home/user/.local/bin:$POETRY_HOME/bin:$PATH"
 WORKDIR $HOME/app
 
-ENV PYTHONPATH=/app
+ENV PYTHONPATH=$HOME/app
 
 # Install Poetry
-RUN curl -sSL https://install.python-poetry.org | python && \
-    cd /usr/local/bin && \
-    ln -s /opt/poetry/bin/poetry && \
-    poetry config virtualenvs.create false
+RUN --mount=type=cache,mode=0755,target=/root/.cache/pip pip install poetry
+RUN poetry config virtualenvs.create false
 
 # Install Chromium for web loader
 # Can disable this if you don't use the web loader to reduce the image size
-RUN apt update && apt install -y chromium chromium-driver
+# RUN apt update && apt install -y chromium chromium-driver
 
 # Install dependencies
-COPY ./pyproject.toml ./poetry.lock* /app/
-RUN poetry install --no-root --no-cache --only main
+COPY ./pyproject.toml ./poetry.lock* $HOME/app/
+RUN --mount=type=cache,target=$POETRY_CACHE_DIR poetry install --no-root --without dev
 
 # ====================================
-FROM build as release
+FROM python:3.11-slim-buster as release
 
 COPY . .
 
-CMD ["python", "main.py"]
+ENTRYPOINT ["python", "main.py"]