Add permissions to workflows (#33)

Author: gaborbernat

.github/workflows/check.yaml

@@ -12,6 +12,9 @@ concurrency:
   group: check-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   test:
     runs-on: ubuntu-latest

.github/workflows/release.yaml

@@ -3,6 +3,9 @@ on:
   push:
     tags: ["*"]
 
+permissions:
+  contents: read
+
 env:
   dists-artifact-name: python-package-distributions