👷 Add build theme workflow

.github/workflows/build-theme.yml

@@ -0,0 +1,25 @@
+name: Build Theme
+
+on: [pull_request_target]
+
+jobs:
+  build:
+    runs-on: ubuntu-latest
+    if: ${{ github.actor == 'dependabot[bot]' }}
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v3
+        with:
+          ref: "${{ github.head_ref }}"
+      - name: Install dependencies and Build Theme
+        uses: actions/setup-node@v3
+      - run: npm install
+      - run: npm run build
+      - name: Commit CSS changes
+        uses: stefanzweifel/git-auto-commit-action@v4
+        with:
+          branch: "${{ github.head_ref }}"
+          push_options: "--dry-run"
+          file_pattern: "assets/css/compiled/main.css"
+          commit_message: "💄 Rebuild CSS"
+      - run: git push