ci: update release workflow permissions

Author: mirkobrombin

.github/workflows/release.yml

@@ -11,6 +11,9 @@ jobs:
     container:
       image: ghcr.io/vanilla-os/pico:main
 
+    permissions:
+      contents: write
+
     steps:
       - uses: actions/checkout@v4
 
@@ -26,4 +29,4 @@ jobs:
         with:
           token: "${{ secrets.GITHUB_TOKEN }}"
           files: |
-            hrun
+            hrun