ci(pr): skip build-all for non-image changes + auto-cancel runs

[guimard]

pr.yml runs ./build-all (every image, single runner) on every branch
push — slow, and it gets cancelled (see the red test on recent CI-only PRs
like #17, whose change never touched an image).

Two changes, pr.yml only:

• paths-ignore: don't run build-all when a push only touches
  helm/**, .github/**, **.md, LICENSE or cleanup-old-tags.sh.
  Uses an ignore list (not an allowlist) so any real image path still triggers.
• concurrency + cancel-in-progress: a new push cancels the previous
  in-flight run on the same branch instead of stacking them.

Note: if test is a required status check, a skipped run leaves it pending;
you may want to make it non-required (or a required check that reports success
when skipped). Scope: master only, as requested.

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📥 Commits

Reviewing files that changed from the base of the PR and between c5e29a4 and db3ddd1.

📒 Files selected for processing (1)

• .github/workflows/pr.yml

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch ci/lighten-pr-build

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