GitHub Workflows security hardening (#4586)

.github/workflows/run-check.yaml

@@ -3,6 +3,10 @@ on:
   workflow_dispatch:
   schedule:
     - cron: '0 0 * * 0'
+
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+
 jobs:
   build:
     name: Running test

.github/workflows/site-deploy.yaml

@@ -5,6 +5,9 @@ on:
     branches:
       - 'main'
 
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+
 jobs:
   build:
     name: Make and Deploy site

.github/workflows/tests.yaml

@@ -6,6 +6,9 @@ on:
       - 'main'
   pull_request:
 
+permissions:
+  contents: read  #  to fetch code (actions/checkout)
+
 jobs:
   build:
     name: Running test