add permissions to workflows

Author: clhain

.github/workflows/build-pages.yml

@@ -11,6 +11,8 @@ name: Pages-CI
 jobs:
   validate:
     name: Validate HTML
+    permissions:
+      contents: read
     strategy:
       fail-fast: false
     runs-on: ubuntu-latest

.github/workflows/check-branch.yml

@@ -7,6 +7,8 @@ on:
 
 jobs:
   check-branch:
+    permissions:
+      contents: read
     runs-on: ubuntu-latest
     steps:
       - name: Check branch

.github/workflows/push-image.yml

@@ -6,6 +6,9 @@ on:
       - 'v[0-9]+.[0-9]+.[0-9]+'
 jobs:
   Pull-From_Gitlab:
+    permissions:
+      contents: read
+      packages: write
     runs-on: ubuntu-latest
     steps:
       - name: "Checkout source code"