Use github.sha for current commit reference

Author: Arlodotexe

.github/workflows/build.yml

@@ -101,7 +101,7 @@ jobs:
           
       - name: Get changed components
         run: |
-          $changedComponents = $(./tooling/Get-Changed-Components.ps1 ${{ env.PREV_TAG_COMMIT || github.event.before }} ${{ github.ref || github.event.after }})
+          $changedComponents = $(./tooling/Get-Changed-Components.ps1 ${{ env.PREV_TAG_COMMIT || github.event.before }} ${{ github.sha || github.event.after }})
           $buildableChangedComponents = $(./tooling/MultiTarget/Filter-Supported-Components.ps1 -Components $changedComponents -MultiTargets ${{ matrix.multitarget }} -WinUIMajorVersion ${{ matrix.winui }})
           echo "CHANGED_COMPONENTS_LIST=$(($buildableChangedComponents | ForEach-Object { "$_" }) -join ',')" >> $env:GITHUB_ENV
           echo "HAS_BUILDABLE_COMPONENTS=$($buildableChangedComponents.Count -gt 0)" >> $env:GITHUB_ENV