Add explicit permissions to GitHub Actions workflow files

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

Author: Copilot

.github/workflows/nodejs.yml

@@ -1,6 +1,10 @@
 name: Node CI
 
 on: push
+
+permissions:
+  contents: read
+
 jobs:
   build:
     runs-on: ubuntu-latest

.github/workflows/publish.yml

@@ -4,6 +4,9 @@ on:
   release:
     types: [created]
 
+permissions:
+  contents: read
+
 jobs:
   publish-npm:
     runs-on: ubuntu-latest