ENG-3508 Fix release-tag workflow cache cleanup

[sahil-roe]

Disable uv cache uploads in the release-tag workflow. A merge without a pyproject.toml change skips dependency installation, leaving no cache directory; setup-uv's post-job cache save then fails even though tagging was correctly skipped.

The version detection and tag creation logic are unchanged. Tracks ENG-3508.

Self-review

Reviewed the complete one-line diff against main; no actionable findings. No Python source or dependencies changed.

Test Plan

• Parsed workflow YAML and checked the supported setup-uv enable-cache input.
• Executed the version-detection script against the original no-version-change merge; it exits successfully with no version output, leaving tag creation skipped.
• git diff --check passes.
• Verify the release-tag workflow succeeds on the main push after merge; this workflow only runs on main pushes.

[greptile-apps]

Confidence Score: 5/5

The PR appears safe to merge because the change disables only an optional cache optimization while preserving uv installation and release-tag behavior.

Summary

Disables uv caching in the release-tag workflow so pushes without dependency installation do not fail during the post-job cache upload.

• Leaves version detection and tag creation unchanged.
• Uses a supported setup-uv input value.
• No Python source code or dependencies are changed.

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