build: create development build and a separate production compose stack

Dockerfile

@@ -1,35 +1,31 @@
-# --- Etap 1: budowa panelu ---------------------------------------------------
-FROM node:22-alpine AS frontend-build
-
+# --- Frontend build ---------------------------------------------------------
+FROM node:22-alpine AS frontend-deps
 WORKDIR /frontend
-
 COPY frontend/package.json frontend/package-lock.json ./
 RUN npm ci
 
+FROM frontend-deps AS frontend-build
 COPY frontend/ ./
 RUN npm run build
 
-# --- Etap 2: aplikacja -------------------------------------------------------
-FROM python:3.13-slim
-
-# Zależności systemowe: opus dla głosu, ffmpeg do dekodowania audio
-RUN apt-get update && apt-get install -y \
-    libopus0 \
-    libopus-dev \
-    ffmpeg \
-    build-essential \
+# --- Python base ------------------------------------------------------------
+FROM python:3.13-slim AS python-base
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    libopus0 ffmpeg \
     && rm -rf /var/lib/apt/lists/*
-
 WORKDIR /app
-
-# Zależności przed źródłami, aby korzystać z cache warstw.
-COPY requirements.txt .
+COPY requirements.txt ./requirements.txt
 RUN pip install --no-cache-dir -r requirements.txt
 
+# --- Development ------------------------------------------------------------
+FROM python-base AS dev
+RUN pip install --no-cache-dir ruff pytest
+EXPOSE 8000
+CMD ["python", "-u", "main.py"]
+
+# --- Production -------------------------------------------------------------
+FROM python-base AS prod
 COPY . .
 COPY --from=frontend-build /frontend/dist /app/static
-
 EXPOSE 8000
-
-# Python serwuje API oraz zbudowany panel webowy.
 CMD ["python", "-u", "main.py"]