Update Dockerfile

Dockerfile

@@ -1,20 +1,63 @@
-FROM python:3.8-slim as python-base
-ENV DOCKER=true
-ENV GIT_PYTHON_REFRESH=quiet
+# Dockerfile from https://github.com/python-poetry/poetry/discussions/1879
+# `python-base` sets up all our shared environment variables
+FROM python:3.9.5-slim as python-base
+ENV PYTHONUNBUFFERED=1 \
+    # prevents python creating .pyc as files
+    PYTHONDONTWRITEBYTECODE=1 \
+    \
+    # pip
+    PIP_NO_CACHE_DIR=off \
+    PIP_DISABLE_PIP_VERSION_CHECK=on \
+    PIP_DEFAULT_TIMEOUT=100 \
+    \
+    # poetry
+    # https://python-poetry.org/docs/configuration/#using-environment-variables
+    POETRY_VERSION=1.6.1 \
+    # make poetry install to this location
+    POETRY_HOME="/opt/poetry" \
+    # make poetry create the virtual environment in the project's root
+    # it gets named `.venv`
+    POETRY_VIRTUALENVS_IN_PROJECT=true \
+    # do not ask any interactive question
+    POETRY_NO_INTERACTION=1 \
+    \
+    # paths
+    # this is where our requirements + virtual environment will live
+    PYSETUP_PATH="/opt/pysetup" \
+    VENV_PATH="/opt/pysetup/.venv" \
+    # Hikka
+    DOCKER=true \
+    GIT_PYTHON_REFRESH=quiet
 
-ENV PIP_NO_CACHE_DIR=1 \
-    PYTHONUNBUFFERED=1 \
-    PYTHONDONTWRITEBYTECODE=1
+# prepend poetry and venv to path
+ENV PATH="$POETRY_HOME/bin:$VENV_PATH/bin:$PATH"
 
-RUN apt update && apt install libcairo2 git build-essential -y --no-install-recommends
-RUN rm -rf /var/lib/apt/lists /var/cache/apt/archives /tmp/*
 
-RUN mkdir /data
+# `builder-base` stage is used to build deps + create our virtual environment
+FROM python-base as builder-base
+RUN apt-get update && apt-get install --no-install-recommends -y \
+    # deps for installing poetry
+    curl \
+    # deps for building python deps
+    build-essential
+
+# install poetry - respects $POETRY_VERSION & $POETRY_HOME
+RUN curl -sSL https://install.python-poetry.org | python -
+
+# copy project requirement files here to ensure they will be cached.
+WORKDIR $PYSETUP_PATH
+COPY poetry.lock pyproject.toml ./
+
+# install runtime deps - uses $POETRY_VIRTUALENVS_IN_PROJECT internally
+RUN poetry install --no-dev
+
+
+# `production` image used for runtime
+FROM python-base as production
+COPY --from=builder-base $PYSETUP_PATH $PYSETUP_PATH
 
-COPY . /data/Hikka
 WORKDIR /data/Hikka
-
-RUN pip install --no-warn-script-location --no-cache-dir -U -r requirements.txt
+COPY . /data/Hikka
 
 EXPOSE 8080