feat: add macos CI (#1704)

PR adding macOS configuration to Example app and adding CI job for building the app on macOS.

.github/workflows/macos-build-test.yml

@@ -20,3 +20,18 @@ jobs:
     steps:
       - name: checkout
         uses: actions/checkout@v2
+      - name: Use Node.js 14
+        uses: actions/setup-node@v2
+        with:
+          node-version: 14
+          cache: 'yarn'
+          cache-dependency-path: 'Example/yarn.lock'
+      - name: Install node dependencies
+        working-directory: ${{ env.WORKING_DIRECTORY }}
+        run: yarn
+      - name: Install pods
+        working-directory: ${{ env.WORKING_DIRECTORY }}/macos
+        run: pod install
+      - name: Build app
+        working-directory: ${{ env.WORKING_DIRECTORY }}
+        run: yarn macos