Limit github action permissions

.github/workflows/ci.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ master ]
 
+permissions:
+    contents: read
+
 jobs:
   build-linux:
     runs-on: ubuntu-latest
@@ -21,18 +24,3 @@ jobs:
 
     - name: Build and run tests
       run: make check
-
-#  build-macos:
-#    runs-on: macos-latest
-#
-#    steps:
-#    - uses: actions/checkout@v4
-#
-#    - name: Install check
-#      run: brew install check
-#
-#    - name: Build scsniff
-#      run: make
-#
-#    - name: Build and run tests
-#      run: make check