GitHub Workflows security hardening (#6762)

Signed-off-by: Alex <aleksandrosansan@gmail.com>

.github/workflows/main-sonar-check.yml

@@ -22,6 +22,10 @@ on:
     branches:
       - main
 
+permissions:
+  contents: read # to fetch code (actions/checkout)
+  pull-requests: write # for sonar to comment on pull-request
+
 jobs:
   build:
     name: Main Sonar JaCoCo Build

.github/workflows/sonar-check.yml

@@ -26,6 +26,10 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.event.pull_request.number || github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read # to fetch code (actions/checkout)
+  pull-requests: write # for sonar to comment on pull-request
+
 jobs:
   build:
     if: github.repository == 'apache/cloudstack'