Update CI config (#1986)

Author: fisker

.github/workflows/main.yml

@@ -2,6 +2,11 @@ name: CI
 on:
   - push
   - pull_request
+permissions:
+  contents: read
+concurrency:
+  group: ${{ github.workflow }}-${{ github.ref }}
+  cancel-in-progress: true
 jobs:
   test:
     name: Node.js ${{ matrix.node-version }} on ${{ matrix.os }}