ci: fix sync upstream workflow

Author: JeromeBu

.github/workflows/sync-upstream.yaml

@@ -7,7 +7,11 @@ on:
 
 jobs:
   sync:
+    name: Sync repository with upstream repository
     runs-on: ubuntu-latest
+    permissions:
+      contents: write
+      actions: write
     steps:
       - name: Checkout fork
         uses: actions/checkout@v4
@@ -22,13 +26,13 @@ jobs:
 
       - name: Add upstream remote
         run: |
-          git remote add upstream git@github.com:codegouvfr/sill.git
+          git remote add upstream https://github.com/codegouvfr/sill.git
           git fetch upstream
 
-      - name: Merge upstream/main
+      - name: Sync with upstream/main
         run: |
           git checkout main
-          git rebase upstream/main
+          git reset --hard upstream/main
 
       - name: Push to origin
-        run: git push origin main --no-verify
+        run: git push origin main --force-with-lease --no-verify