Pin Node for Blacksmith binary builds

Author: RhysSullivan

.github/workflows/pkg-pr-new.yml

@@ -56,6 +56,14 @@ jobs:
           restore-keys: |
             ${{ runner.os }}-bun-1.3.11-
 
+      # No prebuilt better-sqlite3 binary matches the Blacksmith Linux runner,
+      # so `bun install` builds it from source via node-gyp, whose undici needs
+      # Node 22.10+ (webidl.markAsUncloneable).
+      - uses: actions/setup-node@v4
+        if: runner.os == 'Linux'
+        with:
+          node-version: 22
+
       - run: bun install --frozen-lockfile
 
       - name: Build executor preview tarball