feat: webgl_build.ymlを追加 #1

	name: Build

	on:
	# developへのPRマージをトリガーとしてワークフローを開始する
	pull_request:
	branches:
	- develop
	types: [closed]

	# 手動実行デバッグ用
	workflow_dispatch: {}

	jobs:
	build:
	name: Build my project
	runs-on: ubuntu-latest
	steps:
	# Checkout
	- name: Checkout repository
	uses: actions/checkout@v3

	# Build
	- name: Build project
	uses: game-ci/unity-builder@v2
	env:
	UNITY_LICENSE: ${{ secrets.UNITY_LICENSE }}
	with:
	targetPlatform: WebGL
	unityVersion: 2019.4.31f1 # ここは各自プロジェクトに合わせて設定

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