Merge pull request 'change dockerfile' (#2) from dev into main

Reviewed-on: #2

Dockerfile

@@ -1,29 +1,42 @@
-FROM python:3.13-slim
+FROM python:3.13-slim AS builder
 
 # Prevent Python from writing .pyc files and enable unbuffered stdout/stderr
 ENV PYTHONDONTWRITEBYTECODE=1 \
     PYTHONUNBUFFERED=1 \
     PIP_DISABLE_PIP_VERSION_CHECK=1 \
-    # Playwright won't be installed for actual browser automation
     PLAYWRIGHT_SKIP_BROWSER_DOWNLOAD=1
 
 WORKDIR /app
 
-# Install build deps (some packages may need them to compile wheels)
+# Install build deps required to build wheels
 RUN apt-get update \
     && apt-get install -y --no-install-recommends build-essential gcc \
     && rm -rf /var/lib/apt/lists/*
 
-# Upgrade packaging tools
+# Upgrade packaging tools and install runtime dependencies into a separate prefix
 COPY requirements.txt ./
-RUN pip install --no-cache-dir \
+RUN pip install --upgrade pip setuptools wheel \
+    && pip install --prefix=/install --no-cache-dir \
     --extra-index-url https://git.theprivateserver.de/api/packages/PHB/pypi/simple/ \
-    -r requirements.txt && \
-    # Clean up pip cache
-    rm -rf /root/.cache/pip
-# Copy application source
+    -r requirements.txt \
+    && rm -rf /root/.cache/pip
+
+# Copy application source (only used to include app files in final image)
 COPY . /app
 
+FROM python:3.13-slim
+
+ENV PYTHONDONTWRITEBYTECODE=1 \
+    PYTHONUNBUFFERED=1 \
+    API_PORT=8001
+
+WORKDIR /app
+
+# Copy installed packages from the builder image into the final image
+COPY --from=builder /install /usr/local
+# Copy application sources
+COPY --from=builder /app /app
+
 EXPOSE 8001
 
 # Run using uvicorn; the app is defined in `api_service.py` as `app`