Add platform-specific builds and package path variable

Updated `dotnet-windows.yml` to include a new environment variable `Package_Creation_Path` for package creation. Added steps for platform-specific builds for Windows, Android, and iOS for both the library and sample app. Modified existing build steps to accommodate these changes and clarified the NuGet packaging process to include all platforms.

Author: pictos

.github/workflows/dotnet-windows.yml

@@ -18,6 +18,7 @@ env:
     SAMPLE_CSPROJ: samples/PJ.ContextActions.Sample/PJ.ContextActions.Sample.csproj
     NugetPackageVersion: '99.0.0-preview${{ github.run_number }}'
     CurrentSemanticVersionBase: '99.0.0'
+    Package_Creation_Path: './src/PJ.ContextActions.Maui/bin/Release'
 
 jobs:
   build:
@@ -41,18 +42,33 @@ jobs:
     - name: Workload install
       run: dotnet workload install maui
 
+    - name: Install Windows Runtime Pack
+      run: dotnet workload install microsoft-net-runtime-windows-net9.0
+    
     - name: Restore library dependencies
       run: dotnet restore ${{env.LIB_CSPROJ}}
 
     - name: Restore sample dependencies
       run: dotnet restore ${{env.SAMPLE_CSPROJ}}
 
-    - name: Build library
-      run: dotnet build ${{env.LIB_CSPROJ}} -c Release -p:PackageVersion=${{ env.NugetPackageVersion }} -p:Version=${{ env.NugetPackageVersion }} --no-restore
+    # Platform-specific builds for the library
+    - name: Build library (Windows)
+      run: dotnet build ${{env.LIB_CSPROJ}} -c Release -f net9.0-windows10.0.19041.0 -p:PackageVersion=${{ env.NugetPackageVersion }} -p:Version=${{ env.NugetPackageVersion }} --no-restore
+    
+    - name: Build library (Android)
+      run: dotnet build ${{env.LIB_CSPROJ}} -c Release -f net9.0-android -p:PackageVersion=${{ env.NugetPackageVersion }} -p:Version=${{ env.NugetPackageVersion }} --no-restore
+    
+    - name: Build library (iOS)
+      run: dotnet build ${{env.LIB_CSPROJ}} -c Release -f net9.0-ios -p:PackageVersion=${{ env.NugetPackageVersion }} -p:Version=${{ env.NugetPackageVersion }} --no-restore
+    
+    # Platform-specific builds for the sample app
+    - name: Build Sample app (Windows)
+      run: dotnet build ${{env.SAMPLE_CSPROJ}} -c Release -f net9.0-windows10.0.19041.0 --no-restore
 
-    - name: Build Sample app
-      run: dotnet build ${{env.SAMPLE_CSPROJ}} -c Release --no-restore
+    - name: Build Sample app (Android)
+      run: dotnet build ${{env.SAMPLE_CSPROJ}} -c Release -f net9.0-android --no-restore
 
+    # NuGet packaging - this will package all platforms since we've built them all above
     - name: Create Nuget
       run: dotnet pack ${{env.LIB_CSPROJ}} -c Release --no-restore --no-build --include-symbols --include-source