ci: use full-size data files cabinet for release builds

That's the intention, at least.

ci/azure-build-and-test.yml

@@ -1,6 +1,11 @@
 # Copyright 2020-2022 the .NET Foundation
 # Licensed under the MIT License
 
+parameters:
+- name: cabinetBasename
+  type: string
+  default: datafiles_tiny
+
 jobs:
 
 - job: build
@@ -52,10 +57,9 @@ jobs:
       platform: '$(buildPlatform)'
       configuration: '$(buildConfiguration)'
 
-  # TODO: for tagged releases, download a fullsize / up-to-date package
   - powershell: |
       Invoke-WebRequest `
-        "https://wwtfiles.blob.core.windows.net/devops/datafiles_tiny.cabinet" `
+        "https://wwtfiles.blob.core.windows.net/devops/${{ parameters.cabinetBasename }}.cabinet" `
         -OutFile ".\Setup1\datafiles.cabinet"
     displayName: Download installer data files bundle
 

ci/azure-pipelines.yml

@@ -15,6 +15,11 @@ stages:
 - stage: MainBuild
   jobs:
   - template: azure-build-and-test.yml
+    parameters:
+      ${{ if eq(variables['Build.SourceBranchName'], 'rc') }}:
+        cabinetBasename: datafiles_release
+      ${{ else }}:
+        cabinetBasename: datafiles_tiny
 
 - stage: Deploy
   condition: and(succeeded('MainBuild'), ne(variables['build.reason'], 'PullRequest'))