ci: reduce ci permissions to read only + gist for tests

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: ticpu

.github/workflows/ci.yml

@@ -6,11 +6,17 @@ on:
   pull_request:
     branches: [master]
 
+permissions:
+  contents: read
+
 env:
   CARGO_TERM_COLOR: always
 
 jobs:
   test:
+    permissions:
+      contents: read
+      gist: write
     runs-on: ubuntu-latest
     steps:
     - uses: actions/checkout@v7