ci: add least-privilege permissions to GitHub Actions workflows

Add explicit workflow-level permissions blocks to resolve CodeQL actions/missing-workflow-permissions alerts. Scopes are derived from workflow operations.

Refs: APPSEC-164

Author: peter-matkovski

.github/workflows/ci.yml

@@ -6,6 +6,11 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref }}
   cancel-in-progress: true
 
+permissions:
+  actions: write
+  contents: read
+  pull-requests: read
+
 jobs:
   build:
     name: 🧪 Test & lint

.github/workflows/initiate_release.yml

@@ -7,6 +7,10 @@ on:
         description: "The new version number with a 'v' prefix. Example: v1.40.1"
         required: true
 
+permissions:
+  contents: write
+  pull-requests: write
+
 jobs:
   init_release:
     name: 🚀 Create release PR

.github/workflows/javadoc.yml

@@ -3,6 +3,10 @@ on:
   push:
     branches:
       - main
+
+permissions:
+  contents: read
+
 jobs:
   javadoc:
     runs-on: ubuntu-latest

.github/workflows/release.yml

@@ -6,6 +6,10 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read
+  pull-requests: read
+
 jobs:
   Release:
     name: 🚀 Release