use venv in docker

Dockerfile

@@ -1,14 +1,17 @@
 FROM python:3.11-bookworm as base
 
-COPY ./dist /app/dist
-
 ENV PIP_EXTRA_INDEX_URL=https://www.piwheels.org/simple
 ENV PIP_FIND_LINKS=/wheeley
+ENV VENV=/app/.venv
+ENV PATH="$VENV/bin:$PATH"
+
+COPY ./dist /app/dist
 
 RUN <<EOF
     set -ex
 
     mkdir /wheeley
+    python3 -m venv $VENV
     pip3 install --upgrade pip wheel setuptools
     pip3 wheel --wheel-dir=/wheeley -r /app/dist/requirements.txt
     pip3 wheel --wheel-dir=/wheeley /app/dist/*.tar.gz
@@ -18,14 +21,19 @@ FROM python:3.11-slim-bookworm
 EXPOSE 5000
 WORKDIR /app
 
+ENV PIP_FIND_LINKS=/wheeley
+ENV VENV=/app/.venv
+ENV PATH="$VENV/bin:$PATH"
+
 COPY --from=base /wheeley /wheeley
 
 RUN <<EOF
     set -ex
 
-    pip3 install --no-index --find-links=/wheeley brewblox-plaato
-    rm -rf /wheeley
+    python3 -m venv $VENV
+    pip3 install --no-index brewblox_plaato
     pip3 freeze
+    rm -rf /wheeley
 EOF
 
 ENTRYPOINT ["python3", "-m", "brewblox_plaato"]