[ci] Enable source-index for the repo

[radical]

This is to get enrolled into indexing for https://source.dot.net.

[eerhardt]

Does this need any conditions? Like just on windows, or just on official builds, just on main, etc?

[radical]

Good question!

1. This file is for the internal pipeline. The public one is

   aspire/eng/pipelines/azure-pipelines-public.yml

   Line 92 in eb0bd80

   enableSourceIndex: false

2. This pipeline runs only the Windows build right now. There is a linux build in this same file conditioned on _RunAsPublic, which should be defaulting to false for internal builds -

   aspire/eng/pipelines/common-variables.yml

   Lines 13 to 15 in eb0bd80

   	- ${{ if notin(variables['Build.Reason'], 'PullRequest') }}:
   	- name: _RunAsPublic
   	value: False

[radical]

@RussKie why is there a linux job conditioned on _RunAsPublic in

aspire/eng/pipelines/azure-pipelines.yml

Lines 165 to 193 in eb0bd80

	- ${{ if eq(variables._RunAsPublic, True) }}:
	- job: Linux
	# timeout accounts for wait times for helix agents up to 30mins
	timeoutInMinutes: 90
	pool:
	name: NetCore1ESPool-Internal
	image: 1es-mariner-2
	os: linux
	variables:
	- name: _buildScript
	value: $(Build.SourcesDirectory)/build.sh --ci
	preSteps:
	- checkout: self
	fetchDepth: 1
	clean: true
	steps:
	- template: /eng/pipelines/templates/BuildAndTest.yml
	parameters:
	dotnetScript: $(Build.SourcesDirectory)/dotnet.sh
	buildScript: $(_buildScript)
	buildConfig: $(_BuildConfig)
	repoArtifactsPath: $(Build.Arcade.ArtifactsPath)
	repoLogPath: $(Build.Arcade.LogsPath)
	repoTestResultsPath: $(Build.Arcade.TestResultsPath)
	isWindows: false

? When is that run?

[RussKie]

The Ubuntu leg is only run on the public CI. I'm a little vague as to why it's not run on the internal CI (been many months since I asked that question) - I think it was something to do with lack of docker support...
Things may have changed since, so it's possible this condition can be removed now.

[radical]

Ok, so no change needed in this PR.