add github action to preview

.github/workflows/preview.yml

@@ -0,0 +1,40 @@
+name: preview
+on: pull_request
+
+jobs:
+  update:
+    name: EAS Update
+    runs-on: ubuntu-latest
+    permissions:
+      contents: read
+      pull-requests: write
+    steps:
+      - name: Check for EXPO_TOKEN
+        run: |
+          if [ -z "${{ secrets.EXPO_TOKEN }}" ]; then
+            echo "You must provide an EXPO_TOKEN secret linked to this project's Expo account in this repo's secrets. Learn more: https://docs.expo.dev/eas-update/github-actions"
+            exit 1
+          fi
+
+      - name: Checkout repository
+        uses: actions/checkout@v3
+
+      - name: Setup Node
+        uses: actions/setup-node@v3
+        with:
+          node-version: 18.x
+          cache: yarn
+
+      - name: Setup EAS
+        uses: expo/expo-github-action@v8
+        with:
+          eas-version: latest
+          token: ${{ secrets.EXPO_TOKEN }}
+
+      - name: Install dependencies
+        run: yarn install
+
+      - name: Create preview
+        uses: expo/expo-github-action/preview@v8
+        with:
+          command: eas update --auto