[ci] Use new EO compliant build pools (#107)

* [ci] Use new EO compliant build pools

Context: https://eng.ms/docs/initiatives/executive-order/executive-order-requirements/executiveorderoncybersecurity/buildinfraops

Migrates to new build pools as part of ongoing security and compliance
efforts.

Author: pjcollins

azure-pipelines.yml

@@ -17,7 +17,9 @@ stages:
     jobs:
     - job: buildWindows
       pool:
-        vmImage: windows-latest
+        name: AzurePipelines-EO
+        demands:
+        - ImageOverride -equals AzurePipelinesWindows2019compliant
       steps:
         - script: |
             echo "Hello"
@@ -47,7 +49,9 @@ stages:
             pathtoPublish: $(Build.ArtifactStagingDirectory)
     - job: buildLinux
       pool:
-        vmImage: ubuntu-18.04
+        name: AzurePipelines-EO
+        demands:
+        - ImageOverride -equals AzurePipelinesUbuntu18.04compliant
       steps:
         - bash: |
             sudo dpkg --add-architecture i386
@@ -75,7 +79,7 @@ stages:
         - buildlinux
         - buildWindows
       pool:
-        vmImage: macOS-latest
+        vmImage: internal-macos-11
       steps:
         - bash: |
             brew install ninja