chore: bun -> yarn #48

	name: build-app

	on:
	pull_request:
	branches:
	- develop
	- main
	paths:
	- .github/workflows/build-app.yml
	- "typing-app/**"
	workflow_dispatch:

	concurrency:
	group: ${{ github.workflow }}-${{ github.ref }}
	cancel-in-progress: true

	defaults:
	run:
	working-directory: typing-app

	jobs:
	build:
	name: Build
	runs-on: ubuntu-latest
	permissions:
	contents: read
	steps:
	- uses: actions/checkout@v4

	# Corepack enable をしておけば package.json の packageManager を読んで適切なバージョンの yarn を使ってくれる。
	# ただし非公式な方法であり、あくまでワークアラウンド。
	# https://github.com/actions/setup-node/issues/480#issuecomment-1820622085
	# > enable corepack before setup-node.
	- name: Enable Corepack
	run: corepack enable

	- uses: actions/setup-node@v4
	with:
	node-version: '20'
	cache: 'yarn'
	cache-dependency-path: typing-app/yarn.lock

	- name: Install Dependencies
	run: yarn

	- name: Build Next.js Project
	run: yarn build

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