Jack Carter 51afd0cf71 build: use npm ci for clean, reproducible installs (#839) ...

Switch pr-build and the Docker image from `npm install` to `npm ci` (`npm ci --omit=dev` in the image), and enable setup-node's npm cache. Deterministic installs from the committed lockfile; CI now fails fast on an out-of-sync lockfile.

Depends on the lockfile being tracked (PR #838) — npm ci requires a committed package-lock.json.

2026-07-09 13:19:31 +02:00

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build: use npm ci for clean, reproducible installs (#839)

2026-07-09 13:19:31 +02:00