ci: update reuse.yml workflow from template

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

.github/workflows/reuse.yml

@@ -11,9 +11,12 @@ name: REUSE Compliance Check
 
 on: [pull_request]
 
+permissions:
+  contents: read
+
 jobs:
   reuse-compliance-check:
-    runs-on: ubuntu-latest
+    runs-on: ubuntu-latest-low
     steps:
       - name: Checkout
         uses: actions/checkout@11bd71901bbe5b1630ceea73d27597364c9af683 # v4.2.2