add exit code to step that checks for BMI2 instructions in snappy to …

…simplify verification

.github/workflows/bcny-firebase.yml

@@ -139,7 +139,14 @@ jobs:
       - name: Check for Snappy BMI2 instructions
         run: |
           Write-Host "Checking for BMI2 instructions on Snappy.lib..."
-          dumpbin /DISASM "${{ github.workspace }}/BuildRoot/Library/firebase/usr/libs/windows/snappy.lib" | Select-String -Pattern "bzhi"
+          $output = dumpbin /DISASM "${{ github.workspace }}/BuildRoot/Library/firebase/usr/libs/windows/snappy.lib" | Select-String -Pattern "bzhi"
+          if ($output) {
+            Write-Error "The instruction 'bzhi' was found in the disassembly."
+            Write-Error $output
+            exit 1
+          } else {
+            Write-Output "Success! The instruction 'bzhi' was not found in the disassembly."
+          }
 
       - uses: actions/upload-artifact@v3
         with: