Updated build.yml to run incremental component check before uno-check, dotnet restore and msbuild setup.

Since our incremental component checks use pwsh instead of msbuild, we can save an addition 4-6 minutes of CI time by skipping these steps.

Author: Arlodotexe

.github/workflows/build.yml

@@ -107,13 +107,21 @@ jobs:
         with:
           submodules: recursive
           fetch-depth: 0
+          
+      - name: Get changed components
+        run: |
+          $changedComponents = $(./tooling/Get-Changed-Components.ps1 ${{ github.event.before }} ${{ 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
 
       # Restore Tools from Manifest list in the Repository
       - name: Restore dotnet tools
+        if: ${{ env.HAS_BUILDABLE_COMPONENTS == 'true' }}
         run: dotnet tool restore
 
       - name: Run Uno Check to Install Dependencies
-        if: ${{ matrix.multitarget != 'wasdk' && matrix.multitarget != 'linuxgtk' && matrix.multitarget != 'wpf' }}
+        if: ${{ matrix.multitarget != 'wasdk' && matrix.multitarget != 'linuxgtk' && matrix.multitarget != 'wpf' && env.HAS_BUILDABLE_COMPONENTS == 'true' }}
         run: >
           dotnet tool run uno-check 
           --ci
@@ -127,15 +135,9 @@ jobs:
 
       - name: Add msbuild to PATH
         uses: microsoft/setup-msbuild@v2
+        if: ${{ env.HAS_BUILDABLE_COMPONENTS == 'true' }}
         with:
           vs-version: '[17.9,)'
-            # Get changed components
-      - name: Get changed components
-        run: |
-          $changedComponents = $(./tooling/Get-Changed-Components.ps1 ${{ github.event.before }} ${{ 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
 
       # Generate full solution with all projects (sample gallery heads, components, tests)
       - name: Generate solution with ${{ matrix.multitarget }} gallery, components and tests