Add explicit permissions to workflow files

Co-authored-by: jonrohan <[email protected]>

Author: Copilot

.github/workflows/nodejs.yml

@@ -4,6 +4,8 @@ on: push
 jobs:
   build:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@v2
       - name: Use Node.js 18.x

.github/workflows/publish.yml

@@ -7,6 +7,8 @@ on:
 jobs:
   publish-npm:
     runs-on: ubuntu-latest
+    permissions:
+      contents: read
     steps:
       - uses: actions/checkout@v3
       - uses: actions/setup-node@v3