feat: add action for creating PR on tokens sync

.github/workflows/update-tokens.yaml

@@ -0,0 +1,38 @@
+name: Update Design Tokens
+
+on:
+  push:
+    # this branch must be the same as configured in figma tokensbrücke plugin for export.
+    branches: [tokens-sync]
+
+env:
+  CI: true
+
+jobs:
+  create-pr:
+    runs-on: macos-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v4
+      - name: Setup Node.js
+        uses: actions/setup-node@v4
+        with:
+          node-version-file: ".node-version"
+          cache: "npm"
+      - name: Install Dependencies
+        run: npm ci
+      - name: Create changeset
+        # hardcode the changeset file, because the CLI doesn't allow to pass all arguments
+        # and relies on interactive shell usage.
+        run: >
+          echo << EOM  
+          --- "@holisticon/hap-foundation": patch ---
+
+          Updated design tokens EOM > .changeset/update-tokens.md EOM
+      - name: Create Pull Request
+        uses: peter-evans/create-pull-request@v7
+        with:
+          commit-message: "chore: update design tokens"
+          title: Update Design Tokens
+          body: Update design tokens from figma
+          branch: tokens-sync