[ci] Run android on MAUI-Dnceng (dotnet#33997)

### Description of Change

This pull request updates the CI pipeline configuration to introduce and
use a new Linux-based pool for running Android tests, replacing the
previous macOS-based pools. The main changes are the addition of the
`AndroidPoolLinux` parameter and updating the relevant test stage to use
this new pool.

**Pipeline configuration updates:**

* Added a new `AndroidPoolLinux` parameter to `parameters:` in
`eng/pipelines/ci.yml` for specifying a Linux pool (`MAUI-DNCENG`) with
the `1ESPT-Ubuntu22.04` image for Android test runs.
* Updated the `mac_runandroid_tests` stage to use the new
`AndroidPoolLinux` pool instead of the previous macOS-based pools,
ensuring Android tests run on Linux infrastructure.

---------

Co-authored-by: Copilot <198982749+Copilot@users.noreply.github.com>
Co-authored-by: rmarinho <1235097+rmarinho@users.noreply.github.com>
Co-authored-by: Copilot <223556219+Copilot@users.noreply.github.com>

Author: 3 people

eng/pipelines/arcade/setup-test-env.yml

@@ -12,6 +12,8 @@ steps:
   fetchDepth: 1
   clean: true
 
+- template: /eng/pipelines/common/enable-kvm.yml@self
+
 - template: /eng/pipelines/common/provision.yml@self
   parameters:
     checkoutDirectory: '$(System.DefaultWorkingDirectory)'

eng/pipelines/ci.yml

@@ -108,6 +108,13 @@ parameters:
         - ImageOverride -equals ACES_VM_SharedPool_Tahoe
       label: macOS
 
+- name: AndroidPoolLinux
+  type: object
+  default:
+    name: MAUI-DNCENG
+    demands:
+      - ImageOverride -equals 1ESPT-Ubuntu22.04
+
 
 # Condition for MacOSPool comparison lanes (non-ARM64)
 # Runs on: (non-PR on main/net*.0/release/*/inflight/*) OR (PR targeting net*.0/release/*/inflight/*)
@@ -277,12 +284,9 @@ stages:
     # TODO: macOSTemplates and AOT template categories
     - name: mac_runandroid_tests
       ${{ if eq(variables['Build.DefinitionName'], 'maui-pr') }}:
-        pool:
-          name: AcesShared
-          demands:
-            - ImageOverride -equals ACES_arm64_Sequoia_Xcode
+        pool: ${{ parameters.AndroidPoolLinux }}
       ${{ else }}:  
-        pool: ${{ parameters.MacOSPool.internal }}
+        pool: ${{ parameters.AndroidPoolLinux }}
       timeout: 240
       testCategory: RunOnAndroid
 

eng/pipelines/common/device-tests-steps.yml

@@ -35,14 +35,8 @@ steps:
     continueOnError: true
     timeoutInMinutes: 60
 
-# Enable KVM for Android builds on Linux
 - ${{ if and(ne(parameters.buildType, 'buildOnly'), eq(parameters.platform, 'android')) }}:
-  - bash: |
-      echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
-      sudo udevadm control --reload-rules
-      sudo udevadm trigger --name-match=kvm
-    displayName: Enable KVM
-    condition: and(succeeded(), eq(variables['Agent.OS'], 'Linux'))
+  - template: enable-kvm.yml
 
 # Provision the various SDKs that are needed
 - template: provision.yml

eng/pipelines/common/enable-kvm.yml

@@ -0,0 +1,8 @@
+# Enable KVM for Android tests on Linux
+steps:
+- bash: |
+    echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
+    sudo udevadm control --reload-rules
+    sudo udevadm trigger --name-match=kvm
+  displayName: Enable KVM
+  condition: and(succeeded(), eq(variables['Agent.OS'], 'Linux'))

eng/pipelines/common/ui-tests-steps.yml

@@ -50,14 +50,8 @@ steps:
     continueOnError: true
     timeoutInMinutes: 60
 
-# Enable KVM for Android builds on Linux
 - ${{ if and(ne(parameters.buildType, 'buildOnly'), eq(parameters.platform, 'android')) }}:
-  - bash: |
-      echo 'KERNEL=="kvm", GROUP="kvm", MODE="0666", OPTIONS+="static_node=kvm"' | sudo tee /etc/udev/rules.d/99-kvm4all.rules
-      sudo udevadm control --reload-rules
-      sudo udevadm trigger --name-match=kvm
-    displayName: Enable KVM
-    condition: and(succeeded(), eq(variables['Agent.OS'], 'Linux'))
+  - template: enable-kvm.yml
 
 - ${{ if eq(parameters.platform, 'catalyst')}}:
   - bash: |

src/DotNet/DotNet.csproj

@@ -78,7 +78,9 @@
     <!-- Run 'dotnet workload install' for the current running 'dotnet' install -->
     <ItemGroup>
       <_WorkloadSource Include="$(NugetArtifactsPath)" />
-      <_LocalWorkloadIds Include="maui" />
+      <!-- On Linux, install maui-android instead of maui to avoid iOS/macOS dependencies -->
+      <_LocalWorkloadIds Include="maui-android" Condition="$([MSBuild]::IsOSPlatform('linux'))" />
+      <_LocalWorkloadIds Include="maui" Condition="!$([MSBuild]::IsOSPlatform('linux'))" />
 
       <_LocalWorkloadIds Include="tizen" Condition=" '$(IncludeTizenTargetFrameworks)' == 'true' " />
     </ItemGroup>

src/TestUtils/src/Microsoft.Maui.IntegrationTests/AndroidTemplateTests.cs

@@ -1,5 +1,6 @@
 using System.Diagnostics;
 using System.Runtime.InteropServices;
+using System.Text.RegularExpressions;
 using Microsoft.Maui.IntegrationTests.Android;
 
 namespace Microsoft.Maui.IntegrationTests
@@ -94,6 +95,12 @@ public void RunOnAndroid(string id, string framework, string config, string? tri
 			Assert.True(DotnetInternal.New(id, projectDir, framework, output: _output),
 				$"Unable to create template {id}. Check test output for errors.");
 
+			// On Linux, only the maui-android workload is installed. Previous .NET
+			// templates may still include iOS/macOS TFMs causing NETSDK1178 errors
+			// during restore. Strip them so only Android remains.
+			if (TestEnvironment.IsLinux)
+				StripNonAndroidTfms(projectFile, framework);
+
 			var buildProps = BuildProps;
 			if (!string.IsNullOrEmpty(trimMode))
 			{
@@ -128,5 +135,20 @@ void AddInstrumentation(string projectDir)
 				"MainLauncher = true, Name = \"com.microsoft.mauitemplate.MainActivity\"");
 		}
 
+		static void StripNonAndroidTfms(string projectFile, string framework)
+		{
+			var content = File.ReadAllText(projectFile);
+			var androidTfm = $"{framework}-android";
+			// Remove conditional TargetFrameworks lines (iOS/macOS/Windows additions)
+			content = Regex.Replace(content,
+				@"\s*<TargetFrameworks\s+Condition=""[^""]*"">[^<]*</TargetFrameworks>",
+				"");
+			// Set the base TargetFrameworks to Android only
+			content = Regex.Replace(content,
+				@"<TargetFrameworks>[^<]*</TargetFrameworks>",
+				$"<TargetFrameworks>{androidTfm}</TargetFrameworks>");
+			File.WriteAllText(projectFile, content);
+		}
+
 	}
 }