use `List` for linear complexity graph construction #25

	# Copyright 2023 Joel Berkeley
	#
	# Licensed under the Apache License, Version 2.0 (the "License");
	# you may not use this file except in compliance with the License.
	# You may obtain a copy of the License at
	#
	# http://www.apache.org/licenses/LICENSE-2.0
	#
	# Unless required by applicable law or agreed to in writing, software
	# distributed under the License is distributed on an "AS IS" BASIS,
	# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
	# See the License for the specific language governing permissions and
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	on:
	pull_request:
	branches: master
	paths:
	- 'backend/**'

	jobs:
	backend-version:
	runs-on: ubuntu-latest
	steps:
	- uses: actions/checkout@v3
	with:
	fetch-depth: 2
	- name: Check backend version is updated
	run: if [[ -z $(git diff HEAD~1 backend/VERSION) ]]; then exit 1; fi

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