Bump express from 4.18.2 to 4.21.0 in /firebase/functions #8

	name: Cloud Functions for Firebase

	on:
	push:
	branches:
	- main
	paths:
	- 'firebase/functions/**'
	- '!**.md'
	pull_request:
	paths:
	- 'firebase/functions/**'
	- '!**.md'

	jobs:
	test:
	runs-on: ubuntu-latest
	timeout-minutes: 10
	defaults:
	run:
	working-directory: ./firebase/functions
	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	steps:
	- uses: actions/checkout@v3

	- name: setup Node.js
	uses: actions/setup-node@v3
	with:
	node-version: 18
	cache: 'npm'
	# ref. https://zenn.dev/nixieminton/articles/8b26a92feb26d8
	cache-dependency-path: ./firebase/functions/package-lock.json

	- name: Cache firebase emulators
	uses: actions/cache@v3
	with:
	path: ~/.cache/firebase/emulators
	key: ${{ runner.os }}-firebase-emulators-${{ hashFiles('~/.cache/firebase/emulators/**') }}

	- name: Install dependencies
	run: npm ci

	- name: Run tests
	# - --project: GitHub Actionsでは`firebase login`ができないため、プロジェクトの`default`指定が必要
	# `default`は`.firebaserc`の値に依存する
	#
	# - --forceExit: 実行されたjestが終了せずCIがタイムアウトしてしまうため`--forceExit`でテスト終了後強制終了させる
	# ref. https://jestjs.io/docs/cli#--forceexit
	run: npm run test:instance -- --project default

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