chore: workflow to upload theme directory artifact

.github/workflows/deploy.yml

@@ -0,0 +1,44 @@
+name: Build
+
+on:
+  push:
+    branches: [main]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+  pull_request: # remove before merging
+
+    strategy:
+      matrix:
+        node-version: [18.x]
+
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Use Node.js ${{ matrix.node-version }}
+        uses: actions/setup-node@v3
+        with:
+          node-version: ${{ matrix.node-version }}
+
+      - name: Install npm dependencies
+        run: npm ci
+
+      - name: Install PHP dependencies with Composer
+        uses: php-actions/composer@v6
+        with:
+          php_version: '7.4'
+          version: 2.x
+
+      # - name: Run tests
+      #   run: npm test
+
+      - name: Build theme
+        run: npm run build:prod
+
+      - name: Upload theme
+        uses: actions/upload-artifact@v3
+        with:
+          name: theme-dir
+          path: theme