fix(docker): set UV_PYTHON_INSTALL_DIR to avoid permission denied

[devag7]

Fixes #321. Sets UV_PYTHON_INSTALL_DIR during docker build to prevent uv from using root-owned symlinks, allowing pwuser to run python.

[Copilot]

Pull request overview

Note

Copilot was unable to run its full agentic suite in this review.

This PR updates the Docker build to persist uv-managed Python installations across stages by setting a custom uv Python install directory and copying it into the runtime image.

Changes:

• Set UV_PYTHON_INSTALL_DIR=/opt/uv-python in the builder stage before uv sync.
• Copy /opt/uv-python from the builder stage into the runtime stage.
• Set UV_PYTHON_INSTALL_DIR in the runtime stage for consistency.

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[greptile-apps]

Greptile Summary

This PR updates the Docker build so uv-managed Python is installed outside root-only paths. It changes:

• Adds a shared UV_PYTHON_INSTALL_DIR build argument.
• Configures uv sync to install managed Python under /opt/uv-python.
• Copies that managed Python directory into the runtime image.
• Keeps the runtime virtualenv and pwuser entrypoint flow intact.

Confidence Score: 5/5

This looks safe to merge.

• No blocking issues found in the changed code.

_{Reviews (2): Last reviewed commit: "fix(docker): define single ARG for UV_PY..." | Re-trigger Greptile}