add write perms to Ci

Author: clay53

.github/workflows/release.yml

@@ -6,6 +6,8 @@ on:
 jobs:
   rpi4-img:
     runs-on: ubuntu-24.04-arm
+    permissions:
+      contents: write
     steps:
     - uses: actions/checkout@v5
     - uses: cachix/install-nix-action@v31