GHA: simplify workload installation

Author: janusw

.github/workflows/dotnet.yml

@@ -28,10 +28,7 @@ jobs:
         java-version: '11'
     - name: Install .NET MAUI
       shell: pwsh
-      run: |
-        & dotnet nuget locals all --clear
-        & dotnet workload install maui --source https://aka.ms/dotnet6/nuget/index.json --source https://api.nuget.org/v3/index.json
-        & dotnet workload install android ios maccatalyst tvos macos maui wasm-tools maui-maccatalyst --source https://aka.ms/dotnet6/nuget/index.json --source https://api.nuget.org/v3/index.json
+      run: dotnet workload install maui 
     - name: Build library (with nuget package)
       run: dotnet build ./Source/OxyPlot.Maui.Skia/OxyPlot.Maui.Skia.csproj -c Release -t:restore,build,pack -p:PackageOutputPath=./nuget -p:Version=$(git describe) -p:ContinuousIntegrationBuild=true -p:DeterministicSourcePaths=false
     - name: Build sample
@@ -57,10 +54,7 @@ jobs:
       with:
         xcode-version: '26.2'
     - name: Install .NET MAUI
-      run: |
-        dotnet nuget locals all --clear
-        dotnet workload install maui --source https://aka.ms/dotnet6/nuget/index.json --source https://api.nuget.org/v3/index.json
-        dotnet workload install android ios maccatalyst tvos macos maui wasm-tools maui-maccatalyst --source https://aka.ms/dotnet6/nuget/index.json --source https://api.nuget.org/v3/index.json
+      run: dotnet workload install maui 
     - name: Install Android tools
       run: ${ANDROID_SDK_ROOT}/cmdline-tools/latest/bin/sdkmanager --sdk_root=$ANDROID_SDK_ROOT "platforms;android-34" "build-tools;34.0.0" "platform-tools"
     - name: Build library (with nuget package)
@@ -79,7 +73,7 @@ jobs:
       with:
         dotnet-version: 10.0.x
     - name: Install workloads
-      run: dotnet workload install android wasm-tools maui-android
+      run: dotnet workload install maui-android
     - name: Install Android tools
       run: ${ANDROID_SDK_ROOT}/cmdline-tools/latest/bin/sdkmanager --sdk_root=$ANDROID_SDK_ROOT "platform-tools"
     - name: Build library (with nuget package)