Test

Update submodule to latest `release-branch.go1.21` in `microsoft/release-branch.go1.21` #414

	# Copyright (c) Microsoft Corporation.
	# Use of this source code is governed by a BSD-style
	# license that can be found in the LICENSE file.

	# This job tests that the patches apply cleanly, and nothing else. The goal is to test this as
	# quickly as possible. This job is a good signal for devs: GitHub Actions is quick to get an agent,
	# so when this job fails, it's easy to see, and clear to the dev that the rest of the PR's jobs
	# aren't going to succeed and can be ignored.
	#
	# Ideally, failure of this job would block the tests from running, because it would be a waste of
	# time to hit the patch failure N times. However, the actual tests run in AzDO, so we can't
	# reasonably cancel them from here (GitHub Actions).

	name: "Test"

	on:
	pull_request:
	branches: [ microsoft/* ]

	jobs:
	check_patches:
	name: Patches Apply Cleanly
	runs-on: ubuntu-latest
	steps:
	- name: Checkout repository
	uses: actions/checkout@v2

	- run: pwsh eng/run.ps1 submodule-refresh -shallow

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