fix Dockerfile to build and install executable

Signed-off-by: iripiri <ikoester@eonerc.rwth-aachen.de>

Author: iripiri

Dockerfile

@@ -4,15 +4,20 @@ FROM python:3.11 AS builder
 WORKDIR /build
 COPY . .
 
-RUN pip install .
+RUN apt-get update && apt-get install -y --no-install-recommends \
+    build-essential gcc python3-dev pkg-config && \
+    rm -rf /var/lib/apt/lists/* && \
+    pip install --upgrade pip setuptools wheel build
 
-RUN python3 setup.py sdist && \
-    pip install dist/*.tar.gz --target /install
+RUN python -m build && \
+    pip install dist/*.tar.gz --prefix=/install
 
-# minimal runtime image
+# runtime stage
 FROM python:3.11-slim AS runtime
 
-COPY --from=builder /install /usr/local/lib/python3.11/site-packages
+# copy installed Python libs + CLI scripts
+COPY --from=builder /install /usr/local
+
 COPY etc/*.json etc/*.yaml /etc/villas/controller/
 COPY villas-controller.service /etc/systemd/system/