chore: add nightly branch sync

.github/workflows/nightly.yml

@@ -0,0 +1,27 @@
+name: Create and publish docker image
+
+on:
+  workflow_dispatch:
+  schedule:
+    - cron: '0 20 */1 * *'
+
+jobs:
+  sync-branches:
+    runs-on: ubuntu-latest
+    name: Syncing nightly branches
+    steps:
+      - name: Checkout
+        uses: actions/checkout@v2
+
+      - name: Set up Node
+        uses: actions/setup-node@v1
+        with:
+          node-version: 12
+
+      - name: Opening pull request
+        id: pull
+        uses: tretuna/sync-branches@1.4.0
+        with:
+          GITHUB_TOKEN: ${{secrets.GITHUB_TOKEN}}
+          FROM_BRANCH: "main"
+          TO_BRANCH: "nightly"