Switch to yarn

.github/workflow/firebase.yml

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+name: Deploy to Firebase Hosting
+
+on: [push]
+
+jobs:
+FrontDeploy:
+    name: FrontDeploy
+    runs-on: ubuntu-latest
+    steps:
+    - name: Checkout Repo
+        uses: actions/checkout@master
+    - name: setup Node
+        uses: actions/setup-node@v1
+        with:
+        node-version: 10.x
+        registry-url: 'https://registry.npmjs.org'
+   - name: Install Dependencies
+        run: npm install
+    - name: deploy to Firebase Hosting
+        run: |
+        npm run deploy --token=${{ secrets.FIREBASE_TOKEN }}