style: improve Dockerfile readability

docker/Dockerfile

@@ -1,20 +1,12 @@
-FROM python:3.11-slim-bookworm as base
-LABEL org.opencontainers.image.authors="MrPandir <MrPandir@users.noreply.github.com>"
-LABEL org.opencontainers.image.source="https://github.com/twirapp/silero-tts-api-server"
-LABEL org.opencontainers.image.licenses="MIT"
-LABEL org.opencontainers.image.title="Silero TTS API server"
-LABEL org.opencontainers.image.description="This is a simple server that uses Silero models to convert text to audio files over HTTP"
-LABEL org.opencontainers.image.vendor="TwirApp"
+FROM python:3.11-slim-bookworm AS python-and-curl
+RUN apt-get update && apt-get -y --no-install-recommends install curl
 
 # Install all dependencies from pyproject.toml
 # NOTE: Rye is used because you need to determine which version of torch to use +cpu or not
 # NOTE: The problem with uv is that it does not read the rye.excluded-dependencies metadata
-FROM base as dependencies-installer
+FROM python-and-curl AS dependencies-installer
 WORKDIR /app
 RUN <<EOF
-    apt-get -y update && apt-get -y install curl
-    apt-get autoremove && apt-get clean
-
     curl -LsSf https://rye-up.com/get | RYE_INSTALL_OPTION="--yes" RYE_TOOLCHAIN=/usr/local/bin/python3 bash
     ln -s /root/.rye/shims/rye /usr/local/bin/rye
     rye pin 3.11
@@ -24,17 +16,24 @@ COPY pyproject.toml .
 RUN --mount=type=cache,target=/root/.cache rye sync --no-dev
 
 # Install all silero models from the Internet or locally if available in the `models` directory
-FROM base as models-installer
-RUN apt-get -y update && apt-get -y install curl
+FROM python-and-curl AS models-installer
 COPY models models
 COPY install_models.sh install_models.sh
 RUN chmod -x ./install_models.sh && bash ./install_models.sh >&2
 
+# Final State
 # Distroless is a small image with only python, providing a non-root user
 FROM gcr.io/distroless/python3-debian12:nonroot
+LABEL org.opencontainers.image.authors="MrPandir <MrPandir@users.noreply.github.com>"
+LABEL org.opencontainers.image.source="https://github.com/twirapp/silero-tts-api-server"
+LABEL org.opencontainers.image.licenses="MIT"
+LABEL org.opencontainers.image.title="Silero TTS API server"
+LABEL org.opencontainers.image.description="This is a simple server that uses Silero models to convert text to audio files over HTTP"
+LABEL org.opencontainers.image.vendor="TwirApp"
+
 WORKDIR /app
 ENV PATH=/app/.venv/bin:$PATH
-# This is necessary for Python to understand where to look for libraries.
+# This is necessary for python to understand where to look for libraries
 ENV PYTHONPATH="/app/.venv/lib/python3.11/site-packages/:$PYTHONPATH"
 USER nonroot
 COPY --from=models-installer /models models