ci: refactor Windows App SDK step

Author: tido64

.github/actions/setup-windows-app-sdk/action.yml

@@ -0,0 +1,17 @@
+name: Install Windows App SDK
+description: Installs the Windows App SDK and restores NuGet packages for the Windows app
+inputs:
+  solution:
+    description: Path to the solution file for the Windows app
+  working-directory:
+    description: Path to the working directory for this action
+runs:
+  using: composite
+  steps:
+    - name: Install Windows App SDK
+      run: |
+        $script = node --print "require.resolve('react-native-windows/Scripts/rnw-dependencies.ps1')"
+        & $script -Install -NoPrompt -Enterprise
+        nuget restore ${{ inputs.solution }}
+      shell: powershell
+      working-directory: ${{ inputs.working-directory }}

.github/workflows/build.yml

@@ -585,10 +585,10 @@ jobs:
         uses: ./.github/actions/affected
       - name: Install Windows App SDK
         if: ${{ steps.affected.outputs.windows != '' }}
-        run: |
-          ../node_modules/react-native-windows/Scripts/rnw-dependencies.ps1 -Install -NoPrompt -Enterprise
-          nuget restore Example.sln
-        working-directory: packages/app/example/windows
+        uses: ./.github/actions/setup-windows-app-sdk
+        with:
+          solution: Example.sln
+          working-directory: packages/app/example/windows
       - name: Build
         id: build
         if: ${{ steps.affected.outputs.windows != '' }}
@@ -660,10 +660,10 @@ jobs:
         uses: ./.github/actions/affected
       - name: Install Windows App SDK
         if: ${{ steps.affected.outputs.windows != '' }}
-        run: |
-          ../node_modules/react-native-windows/Scripts/rnw-dependencies.ps1 -Install -NoPrompt -Enterprise
-          nuget restore TemplateExample.sln
-        working-directory: template-example/windows
+        uses: ./.github/actions/setup-windows-app-sdk
+        with:
+          solution: TemplateExample.sln
+          working-directory: template-example/windows
       - name: Build
         id: build
         if: ${{ steps.affected.outputs.windows != '' }}