Adding fork sync to daily GH action

.github/workflows/daily.yaml

@@ -8,9 +8,37 @@ on:
 #      - main-source
 
 jobs:
-  build:
+  sync: #this job should run first
     runs-on: ubuntu-latest
+    steps:
+      - name: Checkout main-source branch
+        uses: actions/checkout@v3
+        with:
+          ref: main-source # branch you want to sync
+          repository: nflondo/partner-charts # your forked repository URL
+      - name: Configure Git
+        run: |
+          git config --global user.name "github-actions[bot]"
+          git config --global user.email "github-actions[bot]@users.noreply.github.com"
+      - name: Fetch upstream changes for main-source branch
+        run: |
+          git remote add upstream https://github.com/rancher/partner-charts.git # URL of upstream repository
+          git fetch upstream main-source
+      - name: Merge upstream changes into main-source branch
+        run: |
+          git checkout main-source
+          git merge upstream/main-source --allow-unrelated-histories --no-edit
+          git push origin main-source
+      - name: Merge upstream changes into main branch
+        run: |
+          git fetch upstream main # this fetch is necessary here
+          git checkout main
+          git merge upstream/main --allow-unrelated-histories --no-edit
+          git push origin main
 
+  build:
+    needs: sync #this job should run after "sync" job
+    runs-on: ubuntu-latest
     steps:
     - name: Checkout main-source branch
       uses: actions/checkout@v3