Add GitHub workflow for syncing main to sandbox-production (#327)

.github/workflows/sync-to-production.yaml

@@ -0,0 +1,33 @@
+name: Sync main to sandbox-production
+
+on:
+  push:
+    branches:
+      - main
+
+permissions:
+  contents: write
+  pull-requests: write
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@v3
+        with:
+          fetch-depth: 0 # Fetch all history so we can force push
+
+      - name: Set up Git
+        run: |
+          git config --global user.name 'github-actions[bot]'
+          git config --global user.email 'github-actions[bot]@livekit.io'
+
+      - name: Sync to sandbox-production
+        env:
+          GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+        run: |
+          git checkout sandbox-production || git checkout -b sandbox-production
+          git merge --strategy-option theirs main
+          git push origin sandbox-production