Create main.yml

Signed-off-by: Ryananana <36809659+Ryananana@users.noreply.github.com>

.github/workflows/main.yml

@@ -0,0 +1,18 @@
+name: Sync Fork
+
+on:
+  schedule:
+    - cron: '*/30 * * * *' # every 30 minutes
+  workflow_dispatch: # on button click
+
+jobs:
+  sync:
+
+    runs-on: ubuntu-latest
+
+    steps:
+      - uses: tgymnich/fork-sync@v1.8
+        with:
+          owner: SagerNet
+          base: master
+          head: master