chore: add knip job to main workflow

Author: uni-kakurenbo

.github/workflows/main.yml

@@ -74,6 +74,24 @@ jobs:
           CYPRESS_INSTALL_BINARY: 0
       - name: run type-check
         run: npm run type-check
+  knip:
+    name: run knip
+    runs-on: ubuntu-latest
+    needs: [packages]
+    steps:
+      - name: checkout
+        uses: actions/checkout@v5
+      - name: setup Node
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: ./.node-version
+          cache: npm
+      - name: npm ci
+        run: npm ci
+        env:
+          CYPRESS_INSTALL_BINARY: 0
+      - name: run knip
+        run: npm run knip
   build:
     name: run build
     runs-on: ubuntu-latest