Create Expo Preview Workflow (#142)

Create preview.yml

.github/workflows/preview.yml

@@ -0,0 +1,39 @@
+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@v4
+
+      - name: Setup Bun
+        uses: oven-sh/setup-bun@v1
+        with:
+          bun-version: latest
+
+      - name: Setup EAS
+        uses: expo/expo-github-action@v8
+        with:
+          eas-version: latest
+          token: ${{ secrets.EXPO_TOKEN }}
+
+      - name: Install dependencies
+        run: bun install
+
+      - name: 🚀 Create preview
+        uses: expo/expo-github-action/preview@v8
+        with:
+          command: eas update --auto --branch preview