Fix #1547, parts of #169, #5344, #5365, #5411: Add data layer support for (multiple) classrooms & topic dependencies, and prepare for #4885 #10774

	name: Automatic Workflow Canceller

	# This workflow should be triggered in one of three situations:
	# 1. Manual workflow dispatch via https://github.com/oppia/oppia-android/actions.
	# 2. Upon creation of a PR & updates to that PR.
	#
	# Note that the action being used here automatically accounts for the current branch & the commit
	# hash of the tip of the branch to ensure it doesn't cancel previous workflows that aren't related
	# to the branch being evaluated.
	on:
	workflow_dispatch:
	pull_request:

	jobs:
	cancel:
	name: Cancel Previous Runs
	runs-on: ubuntu-20.04
	steps:
	# See https://github.com/styfle/cancel-workflow-action for details on this workflow.
	- uses: styfle/cancel-workflow-action@0.6.0
	with:
	workflow_id: main.yml
	access_token: ${{ github.token }}

Provide feedback