Added troubleshooting doc, and including pipenv and poetry into the build

Author: jski

Dockerfile

@@ -36,4 +36,7 @@ COPY --from=ghcr.io/astral-sh/uv:latest /uv /uvx /bin/
 RUN uv venv
 
 ENV VIRTUAL_ENV=/.venv
-ENV PATH="/bin:$VIRTUAL_ENV/bin:$PATH"
+ENV PATH="/bin:$VIRTUAL_ENV/bin:$PATH"
+
+# Install modern Python package managers for completeness
+RUN uv pip install --no-cache poetry pipenv pdm