ci: add token permissions

Author: foosel

.github/workflows/build.yml

@@ -14,7 +14,15 @@ env:
 jobs:
   build:
     name: "Build"
+
     runs-on: ubuntu-latest
+
+    permissions:
+      contents: read
+      packages: write
+      attestations: write
+      id-token: write
+
     steps:
     - name: "⬇ Checkout"
       uses: actions/checkout@v4