added github workflow to sync with upstream

.github/workflows/sync.yml

@@ -0,0 +1,42 @@
+name: Sync Fork
+
+on:
+  schedule:
+    - cron: '0 * * * *'  # Runs every hour
+  workflow_dispatch:
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    steps:
+      - name: Checkout repo
+        uses: actions/checkout@v2
+
+      - name: Setup Git
+        run: |
+          git config --global user.name 'dbaranovstonfi'
+          git config --global user.email '[email protected]'
+
+      - name: Fetch all branches
+        run: git fetch --all
+
+      - name: Add remote upstream
+        run: git remote add upstream https://github.com/ton-blockchain/ton
+
+      - name: Fetch upstream branches
+        run: git fetch upstream
+
+      - name: Sync branches
+        run: |
+          for branch in $(git branch -r | grep upstream | grep -v '\->' | sed 's|upstream/||'); do
+            git checkout $branch || git checkout -b $branch
+            git merge upstream/$branch --allow-unrelated-histories
+          done
+
+      - name: Push changes
+        env:
+          PAT: ${{ secrets.PAT }}
+        run: |
+          for branch in $(git branch -r | grep upstream | grep -v '\->' | sed 's|upstream/||'); do
+            git push https://dbaranovstonfi:${PAT}@github.com/ston-fi/ton.git $branch
+          done