Utilize Theme Kit download command

.github/workflows/build.yml

@@ -7,16 +7,21 @@ jobs:
   build:
     runs-on: ubuntu-latest
     steps:
-      - name: Checkout
-        uses: actions/checkout@v2
-
-      - name: Install dependencies
-        run: yarn
+      - uses: pnpm/action-setup@v3
+        with:
+          version: 8
+      - uses: actions/checkout@v4
+        with:
+          ref: ${{ github.event.pull_request.head.ref }}
+      - uses: actions/setup-node@v4
+        with:
+          node-version: 20
+          cache: 'pnpm'
 
       - name: Compile assets
-        run: yarn build
+        run: pnpm install && pnpm build
 
       - name: Commit changes
-        uses: EndBug/add-and-commit@v7
+        uses: EndBug/add-and-commit@v9
         with:
           default_author: github_actions