Create a new branch when merging upstream main to rocm-main (#128)

Author: charleshofer

.github/workflows/rocm-nightly-upstream-sync.yml

@@ -6,6 +6,8 @@ on:
   workflow_dispatch:
   schedule:
     - cron: '0 6 * * 1-5'
+env:
+  SYNC_BRANCH_NAME: ci-upstream-sync-${{ github.run_number }}_${{ github.run_attempt }}
 jobs:
   sync-main:
     permissions:
@@ -15,12 +17,28 @@ jobs:
       - run: gh repo sync rocm/jax -b main
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+  create-sync-branch:
+    needs: sync-main
+    permissions:
+      contents: write
+    runs-on: ubuntu-latest
+    env:
+      GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+    steps:
+      - name: Checkout code
+        uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683  # v4.2.2
+      - name: Create branch
+        run: |
+          git checkout -b $SYNC_BRANCH_NAME main
+          git push origin HEAD
   open-sync-pr:
+    needs: create-sync-branch
     permissions:
       pull-requests: write
     runs-on: ubuntu-latest
     steps:
       - run: |
-          gh pr create --repo $GITHUB_REPOSITORY --head main --base rocm-main --title "CI: $(date +%x) upstream sync" --body "Daily sync with upstream"
+          gh pr create --repo $GITHUB_REPOSITORY --head $SYNC_BRANCH_NAME --base rocm-main --title "CI: $(date +%x) upstream sync" --body "Daily sync with upstream"
         env:
           GH_TOKEN: ${{ secrets.GITHUB_TOKEN }}
+