Fix MAUI workload installation for Linux runners

- Skip MAUI workload on Linux in basic CI (not supported)
- Use specific workloads: android, ios, maccatalyst instead of 'maui'
- Linux builds focus on core .NET components and unit tests only
- Android/iOS platform builds only on supported OS (Windows/macOS)
- Remove Android SDK setup from Linux basic CI

This should resolve the Linux workload installation failures.

Author: jfversluis

.github/workflows/ci-build-and-test.yml

@@ -40,20 +40,17 @@ jobs:
         global-json-file: global.json
 
     - name: Setup Java (for Android builds)
-      if: matrix.os != 'macos-latest'  # Skip Java on macOS for now to keep it simple
+      if: matrix.os != 'ubuntu-latest'  # Only install Java on Windows/macOS where we build Android
       uses: actions/setup-java@v4
       with:
         distribution: 'microsoft'
         java-version: '17'
 
-    - name: Setup Android SDK (Linux only)
-      if: matrix.os == 'ubuntu-latest'
-      uses: android-actions/setup-android@v3
-
     - name: Install dotnet tools
       run: dotnet tool restore
 
-    - name: Install MAUI workload
+    - name: Install MAUI workload (Windows/macOS only)
+      if: matrix.os != 'ubuntu-latest'
       run: dotnet workload install maui
 
     - name: Build build tasks (required first)
@@ -80,6 +77,10 @@ jobs:
     - name: Run Compatibility Unit Tests
       run: dotnet test src/Compatibility/Core/tests/Compatibility.UnitTests/Compatibility.Core.UnitTests.csproj --no-build --configuration Release --logger trx --collect:"XPlat Code Coverage"
 
+    - name: Test Android build (Windows/macOS only)
+      if: matrix.os != 'ubuntu-latest'
+      run: dotnet build src/Controls/samples/Maui.Controls.Sample/Maui.Controls.Sample.csproj -f net9.0-android --configuration Release
+
     - name: Upload test results
       uses: actions/upload-artifact@v4
       if: always()

.github/workflows/ci-extended-build.yml

@@ -43,16 +43,13 @@ jobs:
     - name: Install dotnet tools
       run: dotnet tool restore
 
-    - name: Install MAUI workload
-      run: dotnet workload install maui
-
-    - name: Build build tasks
+    - name: Build build tasks (Linux - core only)
       run: dotnet build ./Microsoft.Maui.BuildTasks.slnf
 
     - name: Build and test core
       id: build
       run: |
-        echo "Building core solution..."
+        echo "Building core solution (Linux - no platform workloads)..."
         dotnet build Microsoft.Maui.sln --configuration Release
         
         echo "Running unit tests..."
@@ -94,8 +91,8 @@ jobs:
     - name: Install dotnet tools
       run: dotnet tool restore
 
-    - name: Install MAUI workload
-      run: dotnet workload install maui
+    - name: Install MAUI Android workload
+      run: dotnet workload install android
 
     - name: Build build tasks
       run: dotnet build ./Microsoft.Maui.BuildTasks.slnf
@@ -128,8 +125,8 @@ jobs:
     - name: Install dotnet tools
       run: dotnet tool restore
 
-    - name: Install MAUI workload
-      run: dotnet workload install maui
+    - name: Install MAUI iOS workload
+      run: dotnet workload install ios maccatalyst
 
     - name: Build build tasks
       run: dotnet build ./Microsoft.Maui.BuildTasks.slnf
@@ -163,8 +160,8 @@ jobs:
     - name: Install dotnet tools
       run: dotnet tool restore
 
-    - name: Install MAUI workload
-      run: dotnet workload install maui
+    - name: Install MAUI Android workload
+      run: dotnet workload install android
 
     - name: Build device tests
       run: |

.github/workflows/staged-ci-orchestrator.yml

@@ -59,8 +59,8 @@ jobs:
     - name: Install dotnet tools
       run: dotnet tool restore
 
-    - name: Install MAUI workload
-      run: dotnet workload install maui
+    - name: Install Android workload only (Linux)
+      run: dotnet workload install android
 
     - name: Build and test
       id: build-test