CI: Restrict default permissions

Reduces risk of arbitrary code is run by attacker.

Author: tacaswell

{{cookiecutter.github_project_name}}/.github/workflows/publish.yml

@@ -11,6 +11,10 @@ on:
 jobs:
   deploy:
     runs-on: ubuntu-latest
+    permissions:
+      id-token: write
+      attestations: write
+      contents: read
     steps:
     - uses: actions/checkout@v2
       with: