Enable override build machine in Windows OpenSSL build

Author: zooba

windows-release/openssl-build.yml

@@ -14,6 +14,14 @@ parameters:
   displayName: 'Sources Repository'
   type: string
   default: 'https://github.com/python/cpython-source-deps'
+- name: BuildVMName
+  displayName: 'Build VM override'
+  type: string
+  default: windows-latest
+- name: PlatformToolset
+  displayName: 'PlatformToolset'
+  type: string
+  default: '(default)'
 
 
 name: ${{ parameters.SourceTag }}_$(Date:yyyyMMdd)$(Rev:.rr)
@@ -30,13 +38,20 @@ variables:
   value: '$(Build.ArtifactStagingDirectory)'
 - name: SigningDescription
   value: 'OpenSSL for Python (${{ parameters.SourceTag }})'
+- ${{ if ne(parameters.PlatformToolset, '(default)') }}:
+  - name: PlatformToolset
+    value: ${{ parameters.PlatformToolset }}
 
 
 jobs:
 - job: Build_SSL
   displayName: OpenSSL
   pool:
-    vmImage: windows-latest
+    ${{ if eq(parameters.BuildVMName, 'windows-latest') }}:
+      vmImage: windows-latest
+    ${{ else }}:
+      pool: 'Windows Release'
+      demands: Agent.Name -equals '${{ parameters.BuildVMName }}'
 
   strategy:
     matrix: