⚡ Pin Actions by SHA + add permissions block

Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: Gregg Cochran

.github/workflows/validate.yml

@@ -10,6 +10,9 @@ concurrency:
   group: ${{ github.workflow }}-${{ github.ref }}
   cancel-in-progress: true
 
+permissions:
+  contents: read
+
 jobs:
   validate:
     runs-on: ubuntu-latest