Compile pre-built on dev only

.github/workflows/validate_esphome.yml

@@ -195,6 +195,7 @@ jobs:
     name: Prebuilt Firmware
     runs-on: ubuntu-latest
     needs: build_core  # Ensure this job runs after the core build job
+    if: github.ref == 'refs/heads/dev' || github.base_ref == 'dev'
     steps:
       - uses: actions/checkout@main
         with: