fix(ci): add permissions to workflow (#461)

Signed-off-by: Goetz Goerisch <[email protected]>

Author: GoetzGoerisch

.github/workflows/git-mirror.yml

@@ -12,6 +12,8 @@ on:
 jobs:
   mirror:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - name: Checkout repository
         uses: actions/checkout@v5