Simplify GH Actions

.github/workflows/check.yml

@@ -25,31 +25,8 @@ jobs:
       - name: Use latest Node.js
         uses: actions/setup-node@v3
         with:
-          node-version: 20
+          node-version: 18
           cache: "pnpm"
       - run: pnpm install
       - run: pnpm check
-
-  build:
-    needs: check
-    runs-on: ubuntu-latest
-
-    strategy:
-      matrix:
-        node-version:
-          - 16
-          - 18
-          - 20
-
-    steps:
-      - uses: actions/checkout@v3
-      - uses: pnpm/action-setup@v2
-        with:
-          version: 8
-      - name: Use Node.js ${{ matrix.node-version }}
-        uses: actions/setup-node@v3
-        with:
-          node-version: ${{ matrix.node-version }}
-          cache: "pnpm"
-      - run: pnpm install
       - run: pnpm build