Update contributor workflow

.github/workflows/contributors.yml

@@ -5,22 +5,32 @@ on:
     - cron:  '0 0 * * *'
 
 jobs:
-  add-contributors:
+  delete-old-branch:
     runs-on: ubuntu-latest
+    continue-on-error: true
     steps:
-    - uses: actions/checkout@v2
-    - name: Delete old contributors-update branch
+      - 
+        name: Delete old contributors-update branch
         uses: dawidd6/action-delete-branch@v3
         with:
           github_token: ${{secrets.GITHUB_TOKEN}}
           branches: contributors-update
-    - name: Create contributors-update branch
+    
+  add-contributors:
+    runs-on: ubuntu-latest
+    needs: delete-old-branch
+    steps:
+      - 
+        uses: actions/checkout@v2
+      - 
+        name: Create contributors-update branch
         uses: peterjgrainger/action-create-branch@v2.0.1
         env:
           GITHUB_TOKEN: ${{ secrets.GITHUB_TOKEN }}
         with:
           branch: 'contributors-update'
-    - name: Auto-add contributors
+      - 
+        name: Auto-add contributors
         uses: BobAnkh/add-contributors@v0.2.2
         with:
           BRANCH: 'contributors-update'