[CI] Use yaml-templates agent pool selector (#11356)

Use release version of yaml-templates agent pool selector from main

https://github.com/xamarin/yaml-templates/pull/115

tools/devops/automation/build-pipeline.yml

@@ -148,7 +148,14 @@ variables:
   value: 'xamarin-macios'
 - name: PROVISIONATOR_CHANNEL
   value: ${{ parameters.provisionatorChannel }}
-  
+- name: PRBuildPool
+  value: 'VSEng-Xamarin-RedmondMacBuildPool-iOS-Untrusted'
+- name: PRBuildPoolUrl
+  value: 'https://devdiv.visualstudio.com/_settings/agentpools?poolId=366&view=agents'
+- name: CIBuildPool
+  value: 'VSEng-Xamarin-RedmondMacBuildPool-iOS-Trusted'
+- name: CIBuildPoolUrl
+  value: 'https://devdiv.visualstudio.com/_settings/agentpools?poolId=367&view=agents'
 
 trigger:
   branches:

tools/devops/automation/templates/agent-pool-selector.yml

@@ -1,65 +0,0 @@
-#
-# Selects appropriate agent pool based on trigger type (PR or CI)
-#
-parameters:
-  agentPoolPR: 'VSEng-Xamarin-RedmondMacBuildPool-iOS-Untrusted'
-  agentPoolPRUrl: 'https://devdiv.visualstudio.com/_settings/agentpools?poolId=366&view=agents'
-  agentPoolCI: 'VSEng-Xamarin-RedmondMacBuildPool-iOS-Trusted'
-  agentPoolCIUrl: 'https://devdiv.visualstudio.com/_settings/agentpools?poolId=367&view=agents'
-  condition: succeeded()
-
-steps:
-  - powershell: |
-      $buildReason = "$(Build.Reason)"
-      $buildSourceBranchName = "$(Build.SourceBranchName)"
-      $agentPoolPR = "${{ parameters.agentPoolPR }}"
-      $agentPoolPRUrl = "${{ parameters.agentPoolPRUrl }}"
-      $agentPoolCI = "${{ parameters.agentPoolCI }}"
-      $agentPoolCIUrl = "${{ parameters.agentPoolCIUrl }}"
-
-      Write-Host "buildReason: ${buildReason}"
-      Write-Host "buildSourceBranchName: ${buildSourceBranchName}"
-      Write-Host "agentPoolPR: ${agentPoolPR}"
-      Write-Host "agentPoolPRUrl: ${agentPoolPRUrl}"
-      Write-Host "agentPoolCI: ${agentPoolCI}"
-      Write-Host "agentPoolCIUrl: ${agentPoolCIUrl}"
-
-      $agentPool = $agentPoolPR       # Default to Catalina PR pool
-      $agentPoolUrl = $agentPoolPRUrl
-      Write-Host "Default agent pool: ${agentPool}"
-
-      [bool] $isTopicBranch = $False
-      [bool] $isPullRequest = $False
-
-      if (-not ($buildSourceBranchName -eq 'main' -or $buildSourceBranchName -eq 'master' -or $buildSourceBranchName.StartsWith('d16-'))) {
-        $isTopicBranch = $True
-      }
-
-      if ($buildReason -eq 'PullRequest') {
-          $prTargetBranchName = "$(System.PullRequest.TargetBranch)"    # This system variable is only defined (and in turn the value macro replaced) when $buildReason is 'PullRequest'. Consequently, it cannot be defined as part of an input parameter
-          Write-Host "prTargetBranchName: System.PullRequest.TargetBranch: ${prTargetBranchName}"
-          $isPullRequest = $True
-          $targetBranch = $prTargetBranchName
-      } else {
-          $targetBranch = $buildSourceBranchName
-      }
-
-      Write-Host "Settings:"
-      Write-Host "  targetBranch: ${targetBranch}"
-      Write-Host "  isTopicBranch: ${isTopicBranch}"
-      Write-Host "  isPullRequest: ${isPullRequest}"
-
-      if ($isPullRequest) {
-        $agentPool = $agentPoolPR      # Untrusted on-prem iOS pool used for all PRs (including those from forks) and feature/topic branch commits not targeting main or d16-x branches
-        $agentPoolUrl = $agentPoolPRUrl
-      } else {
-        $agentPool = $agentPoolCI      # Trusted on-prem iOS pool used for CIs targeting main and d16-x release branches
-        $agentPoolUrl = $agentPoolCIUrl
-      }
-
-      Write-Host "AgentPoolComputed: ${agentPool}"
-      Write-Host "Selected agent pool: ${agentPoolUrl}"
-      Write-Host "##vso[task.setvariable variable=AgentPoolComputed;isOutput=true]$agentPool"
-    name: setAgentPool
-    displayName: 'AgentPoolSelector: Select agent pool'
-    condition: ${{ parameters.condition }}

tools/devops/automation/templates/build/stage.yml

@@ -43,8 +43,13 @@ jobs:
   steps:
   - checkout: none             # https://docs.microsoft.com/en-us/azure/devops/pipelines/yaml-schema?view=azure-devops&tabs=schema#checkout
 
-  # Selects appropriate agent pool based on trigger type (PR or CI)
-  - template: ../agent-pool-selector.yml
+  # Selects appropriate agent pool based on trigger type (PR or CI); manually triggered builds target the PR pool
+  - template: azure-devops-pools/agent-pool-selector.yml@templates
+    parameters:
+      agentPoolPR: $(PRBuildPool)
+      agentPoolPRUrl: $(PRBuildPoolUrl)
+      agentPoolCI: $(CIBuildPool)
+      agentPoolCIUrl: $(CIBuildPoolUrl)
 
 - job: build
   dependsOn: