Add github workflow

Author: markharding

.github/workflows/main.yml

@@ -0,0 +1,26 @@
+name: Sync Fork
+
+on:
+  schedule:
+    - cron: '0 * * * *' # Runs every hour
+  workflow_dispatch: # Allows you to run it manually
+
+jobs:
+  sync:
+    runs-on: ubuntu-latest
+    permissions:
+      contents: write
+    steps:
+      - name: Checkout target repo
+        uses: actions/checkout@v4
+        with:
+          fetch-depth: 0
+      - name: Sync with Upstream
+        run: |
+          git config user.name "github-actions[bot]"
+          git config user.email "github-actions[bot]@users.noreply.github.com"
+          git remote add upstream https://github.com/futo-org/polycentric.git
+          git fetch upstream
+          git checkout -B origin/develop develop
+          git merge upstream/develop --ff-only || (echo "Conflict detected, manual intervention required" && exit 1)
+          git push origin develop