pnpm corepack, CI bugfix and no warnings for TIMEID

.github/workflows/lint.yml

@@ -42,7 +42,11 @@ jobs:
               uses: actions/setup-node@v6
               with:
                   node-version: ${{ matrix.node-version }}
-                  cache: 'npm'
-            - run: npm ci
-            - run: npm run build --if-present
-            - run: npm run lint
+            # Node ships corepack, which selects the pnpm version pinned in
+            # package.json ("packageManager"). If this self-hosted runner has no
+            # Node, drop the setup-node step above and rely on a preinstalled Node.
+            - run: corepack enable
+            - run: pnpm install --frozen-lockfile
+            - run: pnpm run build
+            - run: pnpm run lint
+            - run: pnpm test