chore: add ci

.github/workflows/updater.yml

+name: Updater CI
+
+on: workflow_dispatch
+
+jobs:
+  release-update:
+    runs-on: macos-latest
+    if: startsWith(github.repository, 'zzzgydi')
+    steps:
+      - name: Checkout repository
+        uses: actions/checkout@v2
+
+      - name: Get yarn cache dir path
+        id: yarn-cache-dir-path
+        run: echo "::set-output name=dir::$(yarn cache dir)"
+
+      - name: Yarn Cache
+        uses: actions/cache@v2
+        id: yarn-cache
+        with:
+          path: ${{ steps.yarn-cache-dir-path.outputs.dir }}
+          key: ${{ runner.os }}-yarn-${{ hashFiles('**/yarn.lock') }}
+          restore-keys: |
+            ${{ runner.os }}-yarn-
+
+      - name: Yarn install
+        run: yarn install
+
+      - name: Release update.json
+        run: yarn run release
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}