CI parallel test on MSVC build (nmake no parallel capability)

Author: mohawk2

.github/workflows/smoke-windows-msvc.yml

@@ -14,6 +14,12 @@ jobs:
     runs-on: windows-latest
 
     steps:
+      - name: CPUs
+        shell: bash
+        run: |
+          export SYSTEM_CORES=$( powershell -NoProfile -Command "& { Get-WmiObject Win32_Processor | Select-Object -Property NumberOfCores }" | perl -0777 -ne 'print $1, "\n" while /(\d+)/g' );
+          echo "SYSTEM_CORES=$SYSTEM_CORES" >> $GITHUB_ENV
+          echo "HARNESS_OPTIONS=j$SYSTEM_CORES" >> $GITHUB_ENV
       - name: Get/extract
         shell: bash
         run: |