change workdir and fix uv venv usage

Dockerfile

@@ -1,8 +1,10 @@
 FROM python:3.14-alpine
 ENV PYTHONUNBUFFERED=1
 COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /usr/local/bin/
-WORKDIR /code/
+WORKDIR /app
 COPY pyproject.toml .
-RUN uv venv && uv pip install -r pyproject.toml
+ENV VIRTUAL_ENV=/opt/venv
+RUN uv venv $VIRTUAL_ENV && uv pip install -r pyproject.toml
+ENV PATH="/opt/venv/bin:$PATH"
 COPY . .
 ENTRYPOINT ["./entrypoint.sh"]