Add permissions at top of file

.github/workflows/dcm-weekly-checks.yaml

diff --git a/.github/workflows/dcm-weekly-checks.yaml b/.github/workflows/dcm-weekly-checks.yaml
index e1c802d..031430d 100644
--- a/.github/workflows/dcm-weekly-checks.yaml
+++ b/.github/workflows/dcm-weekly-checks.yaml
@@ -6,6 +6,8 @@
     - cron: '0 8 * * 1' # Every Monday at 8am
   workflow_dispatch:
 
+permissions: read-all
+
 jobs:
   flutter-prep:
     uses: ./.github/workflows/flutter-prep.yaml