Few tweaks

Author: NikolaMilosavljevic

eng/pipelines/templates/stages/vmr-build.yml

@@ -988,7 +988,7 @@ stages:
     - job: ValidateInstallers_Linux_x64
       displayName: Validate Installers - Linux x64
       pool: ${{ parameters.pool_Linux }}
-      timeoutInMinutes: 240
+      timeoutInMinutes: 30
       steps:
       - template: ../steps/vmr-validate-installers.yml
         parameters:
@@ -998,7 +998,7 @@ stages:
     - job: ValidateInstallers_Linux_arm64
       displayName: Validate Installers - Linux arm64
       pool: ${{ parameters.pool_LinuxArm64 }}
-      timeoutInMinutes: 240
+      timeoutInMinutes: 30
       steps:
       - template: ../steps/vmr-validate-installers.yml
         parameters:

src/SourceBuild/content/test/Microsoft.DotNet.Installer.Tests/LinuxInstallerTests.cs

@@ -55,7 +55,9 @@ public LinuxInstallerTests(ITestOutputHelper outputHelper)
         _contextDir = Path.Combine(_tmpDir, Path.GetRandomFileName());
         Directory.CreateDirectory(_contextDir);
 
-        _excludeLinuxArch = Config.Architecture == Architecture.X64 ? "arm64" : "x64";
+        _excludeLinuxArch = Config.Architecture == Architecture.X64 ?
+                                                   Architecture.Arm64.ToString().ToLower() :
+                                                   Architecture.X64.ToString().ToLower();
     }
 
     public void Dispose()