Rewrite test-image Dockerfile as Alpine with Python 3.13

[nitrobass24]

Summary

• Switch test-image from python:3.12-slim-bookworm (Debian) to python:3.13-alpine
• Aligns test image with production Alpine base — no more OS divergence between test and prod
• Replace apt-get with apk add --no-cache
• Replace groupadd/useradd with Alpine addgroup/adduser
• Same contract preserved: lftp, openssh-client, uv deps, non-root testuser, /app/python workdir

Test plan

• make test-image builds successfully
• make test runs unit tests in the Alpine container
• CI passes (CI does not use this Dockerfile — it runs Python tests natively)

🤖 Generated with Claude Code

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ℹ️ Review info

⚙️ Run configuration

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Run ID: 5be9681c-b6be-47c8-80b0-c1ef25a195f7

📥 Commits

Reviewing files that changed from the base of the PR and between 3518449 and 2b516b2.

📒 Files selected for processing (1)

• src/docker/build/test-image/Dockerfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/test-image-alpine

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