Potential fix for code scanning alert no. 1: Workflow does not contain permissions (#223)

Co-authored-by: Copilot Autofix powered by AI <62310815+github-advanced-security[bot]@users.noreply.github.com>

Author: thpierce

.github/workflows/pr-build.yml

@@ -3,6 +3,8 @@ on:
   pull_request:
     branches: [ main ]
 
+permissions:
+  contents: read
 jobs:
   build:
     name: Build on ${{ matrix.os }}