Set up workflow to auto upgrade dependencies

.github/workflows/upgrade.yml

@@ -0,0 +1,36 @@
+name: Upgrade Dependencies
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '42 0 * * 0'
+
+jobs:
+  upgrade:
+    name: Upgrade Dependencies
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Cache node_modules
+        uses: actions/cache@v2
+        env:
+          CACHE_NAME: cache-node-modules
+        with:
+          path: '**/node_modules'
+          key: ${{ runner.os }}-build-${{ env.CACHE_NAME }}-${{ hashFiles('**/yarn.lock', '**/package-lock.json') }}
+
+      - name: Upgrade dependencies
+        run: yarn upgrade
+
+      - name: Run linter
+        run: yarn lint
+
+      - name: Commit changes
+        run: |
+          git config --global user.name 'Upgrade Dependencies Workflow'
+          git config --global user.email '<>'
+          git add yarn.lock
+          git commit -m "Upgrade Dependencies $(date -u)" || true
+          git push