chore(security): pin Docker images by SHA digest

[williaby]

Summary

Pin Docker base images by SHA digest to fix OpenSSF Scorecard Pinned-Dependencies findings.

• python:3.12-slim -> @sha256:090ba77e2958f6af52a5341f788b50b032dd4ca28377d2893dcf1ecbdfdfe203 (all stages)
• ghcr.io/astral-sh/uv:latest -> ghcr.io/astral-sh/uv:0.11.16@sha256:440fd6477af86a2f1b38080c539f1672cd22acb1b1a47e321dba5158ab08864d

Why

Same root cause as ByronWilliamsCPA/llc-manager#51. Floating tags break supply-chain integrity; immutable digests make the build deterministic and the Scorecard score climb by ~1.0-1.5.

How the SHAs were resolved

• python:3.12-slim digest from Docker Hub tag API (last_updated 2026-05-22)
• uv digest from GHCR OCI registry manifest; the 0.11.16 version tag added alongside digest so Renovate can auto-bump

Test plan

• CI passes (no functional change)
• Container security gate still satisfied
• Next Scorecard run shows Pinned-Dependencies score increase

Generated with Claude Code

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 6c1b9a3 and 5e955bd.

📒 Files selected for processing (1)

• Dockerfile

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch chore/sha-pin-docker-images

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[Copilot]

Pull request overview

Pins Docker base images in the repository’s Dockerfile to immutable SHA256 digests to satisfy OpenSSF Scorecard “Pinned Dependencies” requirements and improve supply-chain determinism for container builds.

Changes:

• Pin python:3.12-slim to a specific SHA256 digest for both the builder and runtime stages.
• Pin the UV tool image used for COPY --from=... to ghcr.io/astral-sh/uv:0.11.16@sha256:... (replacing latest).

[sonarqubecloud]

Quality Gate passed

Issues
0 New issues
0 Accepted issues

Measures
0 Security Hotspots
0.0% Coverage on New Code
0.0% Duplication on New Code

See analysis details on SonarQube Cloud