Add explicit workflow permissions

Co-authored-by: wysaid <1430725+wysaid@users.noreply.github.com>

Author: Copilot

.github/workflows/macos-build.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ "master" ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: "${{ matrix.os-name }} | NDK-${{ matrix.ndk }} | ${{ matrix.build-system }} | ${{ matrix.ffmpeg }} | ${{ matrix.page-size }}"

.github/workflows/ubuntu-build.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ "master" ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: "${{ matrix.os-name }} | NDK-${{ matrix.ndk }} | ${{ matrix.build-system }} | ${{ matrix.ffmpeg }} | ${{ matrix.page-size }}"

.github/workflows/windows-build.yml

@@ -6,6 +6,9 @@ on:
   pull_request:
     branches: [ "master" ]
 
+permissions:
+  contents: read
+
 jobs:
   build:
     name: "${{ matrix.os-name }} | NDK-${{ matrix.ndk }} | ${{ matrix.build-system }} | ${{ matrix.ffmpeg }} | ${{ matrix.page-size }}"