ci: Adjust .NET installer

build/ci/canary.yml

@@ -5,6 +5,12 @@ steps:
       packageType: 'runtime'
       version: '3.1.x'
 
+  - task: UseDotNet@2
+    inputs:
+      packageType: sdk
+      useGlobalJson: true
+      includePreviewVersions: true
+
   - task: nventiveCanaryUpdater@5
     condition: startsWith(variables['Build.SourceBranch'], 'refs/heads/canaries/dev')
     inputs: