ci: restrict GITHUB_TOKEN to read-only in core CI workflows

.github/workflows/ast-grep.yml

@@ -10,6 +10,9 @@ on:
       # globs for files that we want to check with ast-grep here
       - '**/*.lua'
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}
   cancel-in-progress: true

.github/workflows/build.yml

@@ -10,6 +10,9 @@ on:
         description: 'Computed cache key, used for restoring cache in other workflows'
         value: ${{ jobs.build.outputs.cache-key }}
 
+permissions:
+  contents: read
+
 env:
   BUILD_ROOT: ${{ github.workspace }}/${{ inputs.relative-build-root }}
 

.github/workflows/build_and_test.yml

@@ -28,6 +28,9 @@ on:
         type: boolean
         default: false
 
+permissions:
+  contents: read
+
 # cancel previous runs if new commits are pushed to the PR, but run for each commit on master
 concurrency:
   group: ${{ github.workflow }}-${{ github.head_ref || github.run_id }}

.github/workflows/buildifier.yml

@@ -17,6 +17,9 @@ on:
     - master
     - release/*
 
+permissions:
+  contents: read
+
 jobs:
 
   autoformat:

.github/workflows/changelog-requirement.yml

@@ -9,6 +9,9 @@ on:
       - '.requirements'
       - 'changelog/**'
 
+permissions:
+  contents: read
+
 jobs:
   require-changelog:
     if: ${{ !contains(github.event.*.labels.*.name, 'skip-changelog') }}

.github/workflows/changelog-validation.yml

@@ -4,6 +4,9 @@ on:
   pull_request:
     types: [ opened, synchronize ]
 
+permissions:
+  contents: read
+
 jobs:
   validate-changelog:
     name: Validate changelog

.github/workflows/copyright-check.yml

@@ -3,6 +3,9 @@ name: Detect Unexpected EE Changes
 on:
   pull_request:
 
+permissions:
+  contents: read
+
 concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: ${{ github.event_name == 'pull_request' }}