Move to 1ES Pools

Author: mmitche

.vsts-ci.yml

@@ -114,7 +114,12 @@ stages:
       - job: Ubuntu
         displayName: Ubuntu
         pool:
-          vmImage: ubuntu-latest
+          ${{ if eq(variables['System.TeamProject'], 'public') }}:
+            name: NetCore1ESPool-Public
+            demands: ImageOverride -equals Build.Ubuntu.1804.Amd64.Open
+          ${{ if eq(variables['System.TeamProject'], 'internal') }}:
+            name: NetCore1ESPool-Internal
+            demands: ImageOverride -equals Build.Ubuntu.1804.Amd64
         strategy:
           matrix:
             ${{ if in(variables['Build.Reason'], 'PullRequest') }}: