Obtain internal runtime SAS tokens via federated creds (#41797)

Author: mmitche

.vsts-ci.yml

@@ -27,8 +27,6 @@ variables:
 - template: /eng/pipelines/templates/variables/sdk-defaults.yml
 # Variables used: DncEngInternalBuildPool
 - template: /eng/common/templates-official/variables/pool-providers.yml
-# Variables used: dotnetbuilds-internal-container-read-token-base64
-- group: DotNetBuilds storage account read tokens
 # Helix testing requires a token when internally run.
 # Variables used: HelixApiAccessToken
 - group: DotNet-HelixApi-Access

eng/pipelines/templates/jobs/sdk-build.yml

@@ -61,6 +61,9 @@ jobs:
           targetPath: $(Build.SourcesDirectory)/eng/BuildConfiguration
           artifactName: BuildConfiguration
 
+    # Populate internal runtime variables.
+    - template: /eng/common/templates/steps/enable-internal-runtimes.yml
+
     ############### BUILDING ###############
     - ${{ if eq(parameters.pool.os, 'windows') }}:
       - powershell: eng/common/build.ps1