chore(ci): Switch CI workflow to npm from pnpm and add package-lock.json

Author: dean-journeyapps

.github/workflows/ci.yml

@@ -12,17 +12,13 @@ jobs:
       - uses: actions/checkout@v4
       - uses: actions/setup-node@v4
         with:
-          node-version: '18'
-          cache: 'pnpm'
-          check-latest: true
-          package-manager: 'pnpm'
+          node-version: '20'
+          cache: 'npm'
       - name: Install dependencies
-        run: pnpm install --frozen-lockfile
+        run: npm ci
       - name: Run linting
-        run: pnpm run lint
+        run: npm run lint
       - name: Run type checking
-        run: pnpm run type-check
-      - name: Run tests
-        run: pnpm test
+        run: npm run type-check
       - name: Run build
-        run: pnpm run build
+        run: npm run build