build: bump uv to 0.12 and enable uv cache for staging tests

[hkad98]

Two related tooling changes.

Bump uv to 0.12

uv 0.12 is the current release line. Three places pin uv, and all three move together:

Place	Before	After
[tool.uv] required-version	~=0.11.0	~=0.12.0
Dockerfile uv image tag	ghcr.io/astral-sh/uv:0.11	:0.12
tox dependency group, uv bound	~=0.11.0	~=0.12.0
uv-pre-commit hook rev	0.11.0	0.12.5

The tox group bound matters because uv pip install --group resolves fresh from the index and its console script installs over the binary copied into the test image. The comment in pyproject.toml already asks to keep that bound in sync with required-version.

uv.lock changes only the uv package: 0.11.x to 0.12.5. No other locked package moves.

Verified locally: make test-ci-py310 builds an image with uv 0.12.5 and tox-uv 1.35.2, then reports 521 passed, 2 skipped, 3 xfailed.

Note for everyone: run uv self update after you pull. uv 0.11.x refuses to run in this repo now.

Enable the uv cache for staging tests

astral-sh/setup-uv defaults enable-cache to auto, which only caches on GitHub-hosted runners. Staging tests run on the self-hosted infra1-runners-arc group, so every run re-downloaded the whole test dependency set. The step now sets enable-cache: true.

The other uv jobs run on ubuntu-latest, and auto already covers them. build-release.yaml stays untouched: auto skips tag pushes on purpose, and a release build should resolve from a cold cache.

Context: actions/setup-python#818 was declined upstream, so actions/setup-python will not get native cache: uv. The actions/cache workaround from that thread is not needed here, because setup-uv already does the same thing.

[coderabbitai]

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📥 Commits

Reviewing files that changed from the base of the PR and between 005700c and 37932f9.

⛔ Files ignored due to path filters (1)

• uv.lock is excluded by !**/*.lock

📒 Files selected for processing (4)

• .github/workflows/staging-tests.yaml
• .pre-commit-config.yaml
• Dockerfile
• pyproject.toml

🚧 Files skipped from review as they are similar to previous changes (4)

• pyproject.toml
• .pre-commit-config.yaml
• Dockerfile
• .github/workflows/staging-tests.yaml

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📝 Walkthrough

Walkthrough

The PR updates the project to uv 0.12.x, updates the pre-commit hook and Docker builder image, and enables uv caching in the staging test workflow.

Changes

uv Tooling Update

Layer / File(s)	Summary
Align uv tooling and cache configuration .github/workflows/staging-tests.yaml, .pre-commit-config.yaml, pyproject.toml, Dockerfile	The project requires uv 0.12.x, the uv-pre-commit hook uses revision 0.12.5, the Docker builder uses uv 0.12, and staging tests enable uv caching on self-hosted runners.

Estimated code review effort: 1 (Trivial) | ~5 minutes

Merge Risk: ⚪ Minimal · up to 37932

This PR updates the uv toolchain and enables dependency caching for staging tests without any identified merge-blocking risk; it is merge-ready after normal checks and review.

Suggested reviewers: lupko, pcerny

Poem

A rabbit updates tools with care,
uv twelve hops through runner air.
Fresh hooks and builders join the tune,
Cached staging steps run soon.
“Clean checks!” the bunny sings.

🚥 Pre-merge checks | ✅ 5

✅ Passed checks (5 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Description Check	✅ Passed	Check skipped - CodeRabbit’s high-level summary is enabled.
Title check	✅ Passed	The title clearly summarizes the two main changes: updating uv to 0.12 and enabling uv caching for staging tests.

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[coderabbitai]

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[codecov]

Codecov Report

✅ All modified and coverable lines are covered by tests.
✅ Project coverage is 79.44%. Comparing base (005700c) to head (37932f9).

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1739   +/-   ##
=======================================
  Coverage   79.44%   79.44%           
=======================================
  Files         272      272           
  Lines       19012    19012           
=======================================
  Hits        15105    15105           
  Misses       3907     3907           

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