feat: upgrade Python, parameterize base images, optimize layers

Dockerfile

@@ -1,24 +1,38 @@
-# mittaridatapumppu-endpoint
+# syntax=docker/dockerfile:1
 
-FROM python:3.11-alpine
+ARG PYTHON_VERSION="3.12"
+ARG ALPINE_VERSION="3.19"
+
+FROM python:${PYTHON_VERSION}-alpine${ALPINE_VERSION} as build
 
 ENV PYTHONDONTWRITEBYTECODE 1
 ENV PYTHONUNBUFFERED 1
-
-RUN addgroup -S app && adduser -S app -G app
-WORKDIR /home/app
+ENV VIRTUAL_ENV=/opt/venv
+ENV PATH="${VIRTUAL_ENV}/bin:$PATH"
 
 # Install requirements to build aiokafka
-RUN apk add --no-cache \
-  gcc \
-  python3-dev \
-  libc-dev \
-  zlib-dev
+RUN --mount=type=cache,target=/var/cache/apk \
+  apk add gcc python3-dev libc-dev zlib-dev
 
 # Copy and install requirements only first to cache the dependency layer
-COPY --chown=app:app requirements.txt .
-RUN pip install --no-cache-dir --no-compile --upgrade -r requirements.txt
+RUN pip install uv
+
+COPY pyproject.toml ./
+RUN --mount=type=cache,target=/root/.cache/uv \
+uv venv $VIRTUAL_ENV && \
+uv pip install -r pyproject.toml
+
+FROM python:3.12-alpine
+
+ENV PYTHONDONTWRITEBYTECODE 1
+ENV PYTHONUNBUFFERED 1
+ENV VIRTUAL_ENV=/opt/venv
+ENV PATH="${VIRTUAL_ENV}/bin:$PATH"
 
+RUN addgroup -S app && adduser -S app -G app
+WORKDIR /home/app
+
+COPY --from=build --chown=app:app $VIRTUAL_ENV $VIRTUAL_ENV
 COPY --chown=app:app endpoint/ ./endpoint
 COPY --chown=app:app endpoints/ ./endpoints
 
@@ -28,6 +42,5 @@ RUN chgrp -R 0 /home/app && \
 
 USER app
 
-HEALTHCHECK CMD wget --no-verbose --tries=1 --spider localhost:8000/liveness || exit
-CMD ["uvicorn", "endpoint.endpoint:app", "--host", "0.0.0.0", "--port", "8000", "--proxy-headers"]
 EXPOSE 8000/tcp
+CMD ["uvicorn", "endpoint.endpoint:app", "--host", "0.0.0.0", "--port", "8000", "--proxy-headers"]