Updating dependabot-approve-merge.yml workflow from template

Signed-off-by: Nextcloud bot <bot@nextcloud.com>

.github/workflows/dependabot-approve-merge.yml

@@ -8,13 +8,20 @@ name: Dependabot
 on:
   pull_request_target:
     branches:
+      - main
       - master
       - stable*
 
+permissions:
+  contents: read
+
 jobs:
   auto-approve-merge:
     if: github.actor == 'dependabot[bot]'
     runs-on: ubuntu-latest
+    permissions:
+      # for hmarr/auto-approve-action to approve PRs
+      pull-requests: write 
 
     steps:
       # Github actions bot approve