Add required permissions for build attestations

Add id-token, attestations, and contents permissions to the
build-and-inspect job to enable OIDC token generation for
build provenance attestations.

🤖 Generated with [Claude Code](https://claude.com/claude-code)

Co-Authored-By: Claude <noreply@anthropic.com>

Author: RonnyPfannschmidt

.github/workflows/test.yml

@@ -5,6 +5,10 @@ on: [push, pull_request, workflow_dispatch]
 jobs:
   build-and-inspect:
     runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      attestations: write
+      contents: read
 
     steps:
       - uses: actions/checkout@v4