Set GitHub Actions permissions (#2574)

Signed-off-by: J0WI <J0WI@users.noreply.github.com>

Author: J0WI

.github/workflows/images.yml

@@ -1,6 +1,8 @@
 ---
 name: Images
 
+permissions: {}
+
 on:
   pull_request:
   workflow_run:

.github/workflows/update-sh.yml

@@ -1,6 +1,9 @@
 ---
 name: update.sh
 
+permissions:
+  contents: write
+
 on:
   push:
     branches: