Replace hashFiles('**/package-lock.json') with node_version since wrangler
is installed via npm without a lockfile to hash. Removes trailing dash from
cache keys and ensures npm dependencies are regenerated when Node.js version
changes.
Replace local detect-runner-os action with external detect-versions@v1 to
reduce custom action maintenance. Add architecture detection for future
cross-platform support and namespace all cache keys with "continuwuity-"
prefix to prevent collisions with other projects on shared runners.
Updates cache mount IDs in Dockerfiles to match the new namespacing
convention, ensuring consistent cache isolation across CI and Docker builds.
Skip installing Node.js entirely if v20+ is already available, otherwise
install v22. Add npm dependency caching with OS-specific cache keys using
the custom detect-runner-os action for proper cache isolation between
runners. Dependencies normally take just under 10s, so this should more
than halve the doc build time to free up runner slots.
